From ac0691e154d2e7329c75b9636bb815ab93ceb36a Mon Sep 17 00:00:00 2001
From: b4rtaz <b4rtaz@gmail.com>
Date: Wed, 19 Oct 2022 23:53:08 +0200
Subject: [PATCH] improve frame loop performance.

---
 src/nes.js | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/nes.js b/src/nes.js
index 1cdd30c..fc5e07b 100644
--- a/src/nes.js
+++ b/src/nes.js
@@ -109,6 +109,16 @@ NES.prototype = {
         }
       }
 
+      var finalCurX = ppu.curX + cycles;
+      if (
+        !ppu.requestEndFrame &&
+        finalCurX < 341 &&
+        (ppu.spr0HitX < ppu.curX || ppu.spr0HitX >= finalCurX)
+      ) {
+        ppu.curX = finalCurX;
+        continue FRAMELOOP;
+      }
+
       for (; cycles > 0; cycles--) {
         if (
           ppu.curX === ppu.spr0HitX &&