diff --git a/src/config_file.rs b/src/config_file.rs
index efcb57a..d5f5a25 100644
--- a/src/config_file.rs
+++ b/src/config_file.rs
@@ -15,6 +15,7 @@ pub(crate) struct ConfigFile {
     pub p2pool_enabled: bool,
     pub http_server_enabled: bool,
     pub http_server_port: u16,
+    pub gpu_percentage: u8,
 }
 
 impl Default for ConfigFile {
@@ -27,6 +28,7 @@ impl Default for ConfigFile {
             p2pool_enabled: false,
             http_server_enabled: true,
             http_server_port: 18000,
+            gpu_percentage: 100,
         }
     }
 }
diff --git a/src/main.rs b/src/main.rs
index 1f4c57b..12cf525 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,5 @@
-use std::fs;
 use std::str::FromStr;
+use std::{cmp, fs};
 use std::{convert::TryInto, env::current_dir, path::PathBuf, sync::Arc, thread, time::Instant};
 
 use anyhow::{anyhow, Context as AnyContext, Error};
@@ -96,6 +96,10 @@ struct Cli {
     /// Port of HTTP server
     #[arg(long)]
     http_server_port: Option<u16>,
+
+    /// GPU percentage
+    #[arg(long)]
+    gpu_percentage: Option<u8>,
 }
 
 async fn main_inner() -> Result<(), anyhow::Error> {
@@ -139,6 +143,9 @@ async fn main_inner() -> Result<(), anyhow::Error> {
     if let Some(port) = cli.http_server_port {
         config.http_server_port = port;
     }
+    if let Some(percentage) = cli.gpu_percentage {
+        config.gpu_percentage = percentage;
+    }
 
     let submit = true;
 
@@ -210,10 +217,12 @@ fn run_thread<T: EngineImpl>(
 
     let gpu_function = gpu_engine.get_main_function(&context)?;
 
-    let (grid_size, block_size) = gpu_function
+    let (mut grid_size, block_size) = gpu_function
         .suggested_launch_configuration()
         .context("get suggest config")?;
     // let (grid_size, block_size) = (23, 50);
+    grid_size =
+        (grid_size as f64 / 100f64 * cmp::max(cmp::min(100, config.gpu_percentage as usize), 1) as f64).round() as u32;
 
     let output = vec![0u64; 5];
     // let mut output_buf = output.as_slice().as_dbuf()?;