Adding a setting to change the refresh rate

src/settings.rs

@@ -183,6 +183,7 @@ impl Settings {
 
         settings.insert("no_idle".to_string(),  Setting::new_bool(no_idle));
         settings.insert("extra_buffer_frames".to_string(), Setting::new_u16(buffer_frames));
+        settings.insert("refresh_rate".to_string(), Setting::new_u16(60));
 
         Settings { neovim_arguments, settings: Mutex::new(settings) }
     }

src/window.rs

@@ -215,7 +215,8 @@ pub fn ui_loop() {
         }
 
         let elapsed = frame_start.elapsed();
-        let frame_length = Duration::from_secs_f32(1.0 / 60.0);
+        let refresh_rate = SETTINGS.get("refresh_rate").read_u16() as f32;
+        let frame_length = Duration::from_secs_f32(1.0 / refresh_rate);
         if elapsed < frame_length {
             sleep(frame_length - elapsed);
         }