diff --git a/src/main.rs b/src/main.rs
index df62955..3716bb6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,6 +4,7 @@ extern crate rust_util;
 use std::{env, fs, process};
 use std::path::PathBuf;
 use std::process::Command;
+use std::time::SystemTime;
 
 use rust_util::{util_cmd, util_msg};
 use rust_util::util_msg::MessageType;
@@ -47,10 +48,14 @@ fn main() {
         run_script_cmd.arg(arg);
     }
     debugging!("Run command: {:?}", run_script_cmd);
+    let run_command_start = SystemTime::now();
     match util_cmd::run_command_and_wait(&mut run_script_cmd) {
         Err(e) => failure_and_exit!("Run rust-script failed: {}", e),
         Ok(exit_status) => {
             write_script_file_to_src(script_file, cache_script_bin_name);
+            if let Ok(run_command_cost) = SystemTime::now().duration_since(run_command_start) {
+                debugging!("Run command cost: {}ms", run_command_cost.as_millis());
+            }
             process::exit(exit_status.code().unwrap_or_else(|| 0))
         }
     }