diff --git a/Cargo.lock b/Cargo.lock
index 44c4e7a..05f2c36 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -37,6 +37,7 @@ dependencies = [
  "minijinja",
  "modelscope",
  "num",
+ "rayon",
  "reqwest",
  "rocket",
  "serde",
diff --git a/Cargo.toml b/Cargo.toml
index d864a72..752fa9f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -31,6 +31,7 @@ clap = { version = "4.5.51", features = ["derive"] }
 modelscope = "0.1.0"
 dirs = "6.0.0"
 url = "2.5.7"
+rayon = "1.10"
 
 [features]
 flash-attn=["candle-flash-attn"]
diff --git a/src/models/rmbg2_0/generate.rs b/src/models/rmbg2_0/generate.rs
index 57e0a5e..961b90c 100644
--- a/src/models/rmbg2_0/generate.rs
+++ b/src/models/rmbg2_0/generate.rs
@@ -7,7 +7,8 @@ use anyhow::Result;
 use base64::{Engine, prelude::BASE64_STANDARD};
 use candle_core::{DType, Device, Tensor};
 use candle_nn::VarBuilder;
-use image::{Rgba, RgbaImage};
+use image::RgbaImage;
+use rayon::prelude::*;
 use rocket::futures::{Stream, stream};
 
 use crate::{
@@ -52,38 +53,119 @@ impl RMBG2_0Model {
         })
     }
 
+    #[cfg(test)]
+    pub fn h(&self) -> u32 {
+        self.h
+    }
+
+    #[cfg(test)]
+    pub fn w(&self) -> u32 {
+        self.w
+    }
+
+    #[cfg(test)]
+    pub fn img_mean(&self) -> &Tensor {
+        &self.img_mean
+    }
+
+    #[cfg(test)]
+    pub fn img_std(&self) -> &Tensor {
+        &self.img_std
+    }
+
+    #[cfg(test)]
+    pub fn device(&self) -> &Device {
+        &self.device
+    }
+    #[cfg(test)]
+    pub fn dtype(&self) -> DType {
+        self.dtype
+    }
+
+    #[cfg(test)]
+    pub fn model(&self) -> &BiRefNet {
+        &self.model
+    }
     pub fn inference(&self, mes: ChatCompletionParameters) -> Result<Vec<RgbaImage>> {
         let imgs = extract_images(&mes)?;
-        let mut rmbg_png = vec![];
-        for img in imgs {
-            let height = img.height();
-            let width = img.width();
-            let img_tensor = img_transform_with_resize(
-                &img,
-                self.h,
-                self.w,
-                &self.img_mean,
-                &self.img_std,
-                &self.device,
-                self.dtype,
-            )?
-            .unsqueeze(0)?;
-            let rmbg_img = self.model.forward(&img_tensor)?.squeeze(0)?;
-            let alpha_img = float_tensor_to_dynamic_image(&rmbg_img)?;
-            let alpha_img =
-                alpha_img.resize_exact(width, height, image::imageops::FilterType::CatmullRom);
-            let alpha_gray = alpha_img.to_luma8();
-            let mut rgba_img = RgbaImage::new(width, height);
-
-            // 遍历像素并组合
-            for (x, y, pixel) in img.to_rgb8().enumerate_pixels() {
-                let alpha_value = alpha_gray.get_pixel(x, y).0[0];
-                let rgba_pixel = Rgba([pixel.0[0], pixel.0[1], pixel.0[2], alpha_value]);
-                rgba_img.put_pixel(x, y, rgba_pixel);
-            }
-            rmbg_png.push(rgba_img);
+        if imgs.is_empty() {
+            return Ok(vec![]);
         }
-        Ok(rmbg_png)
+
+        // 并行预处理：提取原始尺寸和转换为 tensor
+        let preprocessed: Vec<_> = imgs
+            .par_iter()
+            .map(|img| {
+                let height = img.height();
+                let width = img.width();
+                let tensor = img_transform_with_resize(
+                    img,
+                    self.h,
+                    self.w,
+                    &self.img_mean,
+                    &self.img_std,
+                    &self.device,
+                    self.dtype,
+                );
+                (img.clone(), height, width, tensor)
+            })
+            .collect();
+
+        // 检查预处理是否有错误
+        let mut tensors = Vec::with_capacity(preprocessed.len());
+        let mut meta: Vec<_> = Vec::with_capacity(preprocessed.len());
+        for (img, height, width, tensor_result) in preprocessed {
+            let tensor = tensor_result?;
+            tensors.push(tensor);
+            meta.push((img, height, width));
+        }
+
+        // 批量推理：将所有图片合并为一个 batch
+        // to guobin211: 感谢你贡献的代码，不过现在模型中可变形卷积的实现只支持batch_size=1，所以推理还是用的循环QaQ
+        // let batch_tensor = Tensor::stack(&tensors, 0)?;
+        // let batch_output = self.model.forward(&batch_tensor)?;
+        let mut batch_output = vec![];
+        for img_tensor in tensors {
+            let output = self.model.forward(&img_tensor.unsqueeze(0)?)?.squeeze(0)?;
+            batch_output.push(output);
+        }
+
+        // 并行后处理：生成 RGBA 图像
+        let results: Vec<Result<RgbaImage>> = meta
+            .into_par_iter()
+            .enumerate()
+            .map(|(i, (img, height, width))| {
+                // let rmbg_tensor = batch_output.i(i)?;
+                let rmbg_tensor = &batch_output[i];
+                let alpha_img = float_tensor_to_dynamic_image(rmbg_tensor)?;
+                let alpha_img =
+                    alpha_img.resize_exact(width, height, image::imageops::FilterType::CatmullRom);
+                let alpha_gray = alpha_img.to_luma8();
+
+                let rgb_img = img.to_rgb8();
+                let rgb_raw = rgb_img.as_raw();
+                let alpha_raw = alpha_gray.as_raw();
+                let pixel_count = (width * height) as usize;
+                let mut rgba_raw = vec![0u8; pixel_count * 4];
+
+                // 并行分块写入
+                rgba_raw
+                    .par_chunks_mut(4)
+                    .enumerate()
+                    .for_each(|(idx, chunk)| {
+                        let src = idx * 3;
+                        chunk[0] = rgb_raw[src];
+                        chunk[1] = rgb_raw[src + 1];
+                        chunk[2] = rgb_raw[src + 2];
+                        chunk[3] = alpha_raw[idx];
+                    });
+
+                RgbaImage::from_raw(width, height, rgba_raw)
+                    .ok_or_else(|| anyhow::anyhow!("Failed to create RGBA image"))
+            })
+            .collect();
+
+        results.into_iter().collect()
     }
 }
 
diff --git a/src/utils/img_utils.rs b/src/utils/img_utils.rs
index 1dba19b..7120ab0 100644
--- a/src/utils/img_utils.rs
+++ b/src/utils/img_utils.rs
@@ -8,6 +8,7 @@ use anyhow::{Result, anyhow};
 use base64::{Engine, engine::general_purpose};
 use candle_core::{DType, Device, Tensor};
 use image::{DynamicImage, ImageBuffer, ImageReader, Rgb, RgbImage, imageops};
+use rayon::prelude::*;
 
 use crate::utils::{ceil_by_factor, floor_by_factor, round_by_factor};
 
@@ -78,31 +79,26 @@ pub fn get_image(file: &str) -> Result<DynamicImage> {
     Err(anyhow!("get image from message failed".to_string()))
 }
 
-pub fn extract_image_url(mes: &ChatCompletionParameters) -> Result<Vec<String>> {
+pub fn extract_image_url(mes: &ChatCompletionParameters) -> Vec<&String> {
     let mut img_vec = Vec::new();
-    for chat_mes in mes.messages.clone() {
+    for chat_mes in &mes.messages {
         if let ChatMessage::User { content, .. } = chat_mes
             && let ChatMessageContent::ContentPart(part_vec) = content
         {
             for part in part_vec {
                 if let ChatMessageContentPart::Image(img_part) = part {
-                    let img_url = img_part.image_url;
-                    img_vec.push(img_url.url);
+                    img_vec.push(&img_part.image_url.url);
                 }
             }
         }
     }
-    Ok(img_vec)
+    img_vec
 }
 
 pub fn extract_images(mes: &ChatCompletionParameters) -> Result<Vec<DynamicImage>> {
-    let img_url_vec = extract_image_url(mes)?;
-    let mut img_vec = Vec::new();
-    for url in img_url_vec {
-        let img = get_image(&url)?;
-        img_vec.push(img);
-    }
-    Ok(img_vec)
+    let img_url_vec = extract_image_url(mes);
+    // 并行下载图片
+    img_url_vec.par_iter().map(|url| get_image(url)).collect()
 }
 
 pub fn generate_target_ratios_sorted(min_num: u32, max_num: u32) -> Vec<(u32, u32)> {
diff --git a/tests/messy_test.rs b/tests/messy_test.rs
index 9a0a5cc..066c450 100644
--- a/tests/messy_test.rs
+++ b/tests/messy_test.rs
@@ -1,4 +1,3 @@
-use aha::utils::get_default_save_dir;
 use anyhow::Result;
 use candle_core::Tensor;
 
diff --git a/tests/test_rmbg2_0_perf.rs b/tests/test_rmbg2_0_perf.rs
new file mode 100644
index 0000000..f8f6a4d
--- /dev/null
+++ b/tests/test_rmbg2_0_perf.rs
@@ -0,0 +1,395 @@
+use std::time::Instant;
+
+use anyhow::Result;
+use image::{ImageReader, Rgba, RgbaImage};
+use rayon::prelude::*;
+
+/// 测试像素组合性能对比
+#[test]
+fn test_pixel_combine_performance() -> Result<()> {
+    // cargo test test_pixel_combine_performance -r -- --nocapture
+    let img_path = "./assets/img/gougou.jpg";
+    let img = ImageReader::open(img_path)?.decode()?;
+    // 缩小图片以加快测试
+    let img = img.resize(1024, 1024, image::imageops::FilterType::Nearest);
+    let width = img.width();
+    let height = img.height();
+    let rgb_img = img.to_rgb8();
+
+    // 模拟 alpha 通道
+    let alpha_gray =
+        image::GrayImage::from_fn(width, height, |x, y| image::Luma([((x + y) % 256) as u8]));
+
+    let iterations = 10;
+
+    println!("=== 像素组合性能测试 ===");
+    println!("图片尺寸: {}x{}", width, height);
+    println!();
+
+    // 旧方法：逐像素操作
+    let start = Instant::now();
+    for _ in 0..iterations {
+        let mut rgba_img = RgbaImage::new(width, height);
+        for (x, y, pixel) in rgb_img.enumerate_pixels() {
+            let alpha_value = alpha_gray.get_pixel(x, y).0[0];
+            let rgba_pixel = Rgba([pixel.0[0], pixel.0[1], pixel.0[2], alpha_value]);
+            rgba_img.put_pixel(x, y, rgba_pixel);
+        }
+        std::hint::black_box(&rgba_img);
+    }
+    let old_duration = start.elapsed();
+    println!(
+        "旧方法（逐像素）: {:?}, 平均: {:?}",
+        old_duration,
+        old_duration / iterations
+    );
+
+    // 新方法：串行索引赋值
+    let start = Instant::now();
+    for _ in 0..iterations {
+        let rgb_raw = rgb_img.as_raw();
+        let alpha_raw = alpha_gray.as_raw();
+        let pixel_count = (width * height) as usize;
+        let mut rgba_raw = vec![0u8; pixel_count * 4];
+
+        for i in 0..pixel_count {
+            let dst = i * 4;
+            let src = i * 3;
+            rgba_raw[dst] = rgb_raw[src];
+            rgba_raw[dst + 1] = rgb_raw[src + 1];
+            rgba_raw[dst + 2] = rgb_raw[src + 2];
+            rgba_raw[dst + 3] = alpha_raw[i];
+        }
+
+        let rgba_img = RgbaImage::from_raw(width, height, rgba_raw).unwrap();
+        std::hint::black_box(&rgba_img);
+    }
+    let serial_duration = start.elapsed();
+    println!(
+        "新方法（串行索引）: {:?}, 平均: {:?}",
+        serial_duration,
+        serial_duration / iterations
+    );
+
+    // 新方法：并行分块写入
+    let start = Instant::now();
+    for _ in 0..iterations {
+        let rgb_raw = rgb_img.as_raw();
+        let alpha_raw = alpha_gray.as_raw();
+        let pixel_count = (width * height) as usize;
+        let mut rgba_raw = vec![0u8; pixel_count * 4];
+
+        rgba_raw
+            .par_chunks_mut(4)
+            .enumerate()
+            .for_each(|(i, chunk)| {
+                let src = i * 3;
+                chunk[0] = rgb_raw[src];
+                chunk[1] = rgb_raw[src + 1];
+                chunk[2] = rgb_raw[src + 2];
+                chunk[3] = alpha_raw[i];
+            });
+
+        let rgba_img = RgbaImage::from_raw(width, height, rgba_raw).unwrap();
+        std::hint::black_box(&rgba_img);
+    }
+    let parallel_duration = start.elapsed();
+    println!(
+        "新方法（并行）: {:?}, 平均: {:?}",
+        parallel_duration,
+        parallel_duration / iterations
+    );
+
+    let speedup_serial = old_duration.as_secs_f64() / serial_duration.as_secs_f64();
+    let speedup_parallel = old_duration.as_secs_f64() / parallel_duration.as_secs_f64();
+    println!();
+    println!("串行索引 vs 逐像素: {:.2}x", speedup_serial);
+    println!("并行 vs 逐像素: {:.2}x", speedup_parallel);
+
+    Ok(())
+}
+
+/// 测试图片 resize 性能对比（串行 vs 并行）
+#[test]
+fn test_image_resize_parallel_vs_serial() -> Result<()> {
+    // cargo test test_image_resize_parallel_vs_serial -r -- --nocapture
+    let img_path = "./assets/img/gougou.jpg";
+    let img = ImageReader::open(img_path)?.decode()?;
+    // 缩小原图以加快测试
+    let img = img.resize(2048, 2048, image::imageops::FilterType::Nearest);
+
+    let num_images = 4;
+    let imgs: Vec<_> = (0..num_images).map(|_| img.clone()).collect();
+    let target_h = 1024u32;
+    let target_w = 1024u32;
+
+    let iterations = 10;
+
+    println!("=== 图片 Resize 性能测试 ===");
+    println!("图片数量: {}", num_images);
+    println!("原始尺寸: {}x{}", img.width(), img.height());
+    println!("目标尺寸: {}x{}", target_w, target_h);
+    println!();
+
+    // 串行 resize
+    let start = Instant::now();
+    for _ in 0..iterations {
+        let mut results = Vec::with_capacity(num_images);
+        for img in &imgs {
+            let resized =
+                img.resize_exact(target_w, target_h, image::imageops::FilterType::CatmullRom);
+            results.push(resized);
+        }
+        std::hint::black_box(&results);
+    }
+    let serial_duration = start.elapsed();
+    println!(
+        "串行 resize: {:?}, 平均: {:?}",
+        serial_duration,
+        serial_duration / iterations
+    );
+
+    // 并行 resize
+    let start = Instant::now();
+    for _ in 0..iterations {
+        let results: Vec<_> = imgs
+            .par_iter()
+            .map(|img| {
+                img.resize_exact(target_w, target_h, image::imageops::FilterType::CatmullRom)
+            })
+            .collect();
+        std::hint::black_box(&results);
+    }
+    let parallel_duration = start.elapsed();
+    println!(
+        "并行 resize: {:?}, 平均: {:?}",
+        parallel_duration,
+        parallel_duration / iterations
+    );
+
+    let speedup = serial_duration.as_secs_f64() / parallel_duration.as_secs_f64();
+    println!();
+    println!("并行 vs 串行: {:.2}x", speedup);
+
+    Ok(())
+}
+
+/// 测试后处理阶段并行 vs 串行性能（纯图像操作）
+#[test]
+fn test_postprocess_parallel_vs_serial() -> Result<()> {
+    // cargo test test_postprocess_parallel_vs_serial -r -- --nocapture
+    let img_path = "./assets/img/gougou.jpg";
+    let img = ImageReader::open(img_path)?.decode()?;
+    // 缩小图片以加快测试
+    let img = img.resize(1024, 1024, image::imageops::FilterType::Nearest);
+    let width = img.width();
+    let height = img.height();
+
+    // 模拟多张图片的后处理数据
+    let num_images = 4;
+    let rgb_imgs: Vec<_> = (0..num_images).map(|_| img.to_rgb8()).collect();
+    let alpha_grays: Vec<_> = (0..num_images)
+        .map(|_| {
+            image::GrayImage::from_fn(width, height, |x, y| image::Luma([((x + y) % 256) as u8]))
+        })
+        .collect();
+
+    let iterations = 10;
+
+    println!("=== 后处理阶段性能测试（纯图像操作）===");
+    println!("图片数量: {}", num_images);
+    println!("图片尺寸: {}x{}", width, height);
+    println!();
+
+    // 串行后处理（for-in 循环）
+    let start = Instant::now();
+    for _ in 0..iterations {
+        let mut results = Vec::with_capacity(num_images);
+        for i in 0..num_images {
+            let rgb_raw = rgb_imgs[i].as_raw();
+            let alpha_raw = alpha_grays[i].as_raw();
+            let pixel_count = (width * height) as usize;
+            let mut rgba_raw = vec![0u8; pixel_count * 4];
+
+            for j in 0..pixel_count {
+                let dst = j * 4;
+                let src = j * 3;
+                rgba_raw[dst] = rgb_raw[src];
+                rgba_raw[dst + 1] = rgb_raw[src + 1];
+                rgba_raw[dst + 2] = rgb_raw[src + 2];
+                rgba_raw[dst + 3] = alpha_raw[j];
+            }
+
+            let rgba_img = RgbaImage::from_raw(width, height, rgba_raw).unwrap();
+            results.push(rgba_img);
+        }
+        std::hint::black_box(&results);
+    }
+    let serial_duration = start.elapsed();
+    println!(
+        "串行后处理: {:?}, 平均: {:?}",
+        serial_duration,
+        serial_duration / iterations
+    );
+
+    // 并行后处理（外层并行 + 内层并行）
+    let start = Instant::now();
+    for _ in 0..iterations {
+        let results: Vec<_> = (0..num_images)
+            .into_par_iter()
+            .map(|i| {
+                let rgb_raw = rgb_imgs[i].as_raw();
+                let alpha_raw = alpha_grays[i].as_raw();
+                let pixel_count = (width * height) as usize;
+                let mut rgba_raw = vec![0u8; pixel_count * 4];
+
+                rgba_raw
+                    .par_chunks_mut(4)
+                    .enumerate()
+                    .for_each(|(j, chunk)| {
+                        let src = j * 3;
+                        chunk[0] = rgb_raw[src];
+                        chunk[1] = rgb_raw[src + 1];
+                        chunk[2] = rgb_raw[src + 2];
+                        chunk[3] = alpha_raw[j];
+                    });
+
+                RgbaImage::from_raw(width, height, rgba_raw).unwrap()
+            })
+            .collect();
+        std::hint::black_box(&results);
+    }
+    let parallel_duration = start.elapsed();
+    println!(
+        "并行后处理: {:?}, 平均: {:?}",
+        parallel_duration,
+        parallel_duration / iterations
+    );
+
+    let speedup = serial_duration.as_secs_f64() / parallel_duration.as_secs_f64();
+    println!();
+    println!("后处理性能提升: {:.2}x", speedup);
+
+    Ok(())
+}
+
+/// 测试完整图像处理流程（resize + 像素合并）串行 vs 并行
+#[test]
+fn test_full_image_pipeline_parallel_vs_serial() -> Result<()> {
+    // cargo test test_full_image_pipeline_parallel_vs_serial -r -- --nocapture
+    let img_path = "./assets/img/gougou.jpg";
+    let img = ImageReader::open(img_path)?.decode()?;
+    // 缩小图片以加快测试
+    let img = img.resize(2048, 2048, image::imageops::FilterType::Nearest);
+    let orig_width = img.width();
+    let orig_height = img.height();
+
+    let num_images = 4;
+    let imgs: Vec<_> = (0..num_images).map(|_| img.clone()).collect();
+    let target_h = 1024u32;
+    let target_w = 1024u32;
+
+    // 模拟 alpha 蒙版
+    let alpha_grays: Vec<_> = (0..num_images)
+        .map(|_| {
+            image::GrayImage::from_fn(orig_width, orig_height, |x, y| {
+                image::Luma([((x + y) % 256) as u8])
+            })
+        })
+        .collect();
+
+    let iterations = 10;
+
+    println!("=== 完整图像处理流程性能测试 ===");
+    println!("图片数量: {}", num_images);
+    println!("原始尺寸: {}x{}", orig_width, orig_height);
+    println!("处理尺寸: {}x{}", target_w, target_h);
+    println!();
+
+    // 串行处理流程
+    let start = Instant::now();
+    for _ in 0..iterations {
+        let mut results = Vec::with_capacity(num_images);
+        for i in 0..num_images {
+            // 预处理：resize 到模型输入尺寸
+            let _resized =
+                imgs[i].resize_exact(target_w, target_h, image::imageops::FilterType::CatmullRom);
+
+            // 后处理：合并 RGB 和 alpha
+            let rgb_img = imgs[i].to_rgb8();
+            let rgb_raw = rgb_img.as_raw();
+            let alpha_raw = alpha_grays[i].as_raw();
+            let pixel_count = (orig_width * orig_height) as usize;
+            let mut rgba_raw = vec![0u8; pixel_count * 4];
+
+            for j in 0..pixel_count {
+                let dst = j * 4;
+                let src = j * 3;
+                rgba_raw[dst] = rgb_raw[src];
+                rgba_raw[dst + 1] = rgb_raw[src + 1];
+                rgba_raw[dst + 2] = rgb_raw[src + 2];
+                rgba_raw[dst + 3] = alpha_raw[j];
+            }
+
+            let rgba_img = RgbaImage::from_raw(orig_width, orig_height, rgba_raw).unwrap();
+            results.push(rgba_img);
+        }
+        std::hint::black_box(&results);
+    }
+    let serial_duration = start.elapsed();
+    println!(
+        "串行流程: {:?}, 平均: {:?}",
+        serial_duration,
+        serial_duration / iterations
+    );
+
+    // 并行处理流程
+    let start = Instant::now();
+    for _ in 0..iterations {
+        // 并行预处理
+        let _resized: Vec<_> = imgs
+            .par_iter()
+            .map(|img| {
+                img.resize_exact(target_w, target_h, image::imageops::FilterType::CatmullRom)
+            })
+            .collect();
+
+        // 并行后处理
+        let results: Vec<_> = (0..num_images)
+            .into_par_iter()
+            .map(|i| {
+                let rgb_img = imgs[i].to_rgb8();
+                let rgb_raw = rgb_img.as_raw();
+                let alpha_raw = alpha_grays[i].as_raw();
+                let pixel_count = (orig_width * orig_height) as usize;
+                let mut rgba_raw = vec![0u8; pixel_count * 4];
+
+                rgba_raw
+                    .par_chunks_mut(4)
+                    .enumerate()
+                    .for_each(|(j, chunk)| {
+                        let src = j * 3;
+                        chunk[0] = rgb_raw[src];
+                        chunk[1] = rgb_raw[src + 1];
+                        chunk[2] = rgb_raw[src + 2];
+                        chunk[3] = alpha_raw[j];
+                    });
+
+                RgbaImage::from_raw(orig_width, orig_height, rgba_raw).unwrap()
+            })
+            .collect();
+        std::hint::black_box(&results);
+    }
+    let parallel_duration = start.elapsed();
+    println!(
+        "并行流程: {:?}, 平均: {:?}",
+        parallel_duration,
+        parallel_duration / iterations
+    );
+
+    let speedup = serial_duration.as_secs_f64() / parallel_duration.as_secs_f64();
+    println!();
+    println!("完整流程性能提升: {:.2}x", speedup);
+
+    Ok(())
+}