# Strange FPS difference

**URL:** https://forum.castle-engine.io/t/strange-fps-difference/721
**Category:** Uncategorized
**Created:** [January 20, 2023, 1:08am UTC](https://forum.castle-engine.io/t/strange-fps-difference/721 "2023-01-20T01:08:40Z")
**Posts on this page:** 3
**Page:** 1

<div class="post-metadata">

### Author: ![soastao](https://forum.castle-engine.io/letter_avatar_proxy/v4/letter/s/67e7ee/32.png) [@soastao](https://forum.castle-engine.io/u/soastao)
#### Post date: [January 20, 2023, 1:08am UTC](https://forum.castle-engine.io/t/strange-fps-difference/721/1 "2023-01-20T01:08:40Z")

</div>

I also found a problem, deprecated\_to\_upgrade\isometric\_game this demo ,there are huge differences on different machines(the same code)

A Computer hardware configuration  
IMac2019 CPU intel8500 Memory 40G GPU Intel UHD Graphics 630 + Radeon Pro 570X

B Computer hardware configuration  
GTR6 CPU amd 5900HX Memory 32G GPU Integrated Graphics

Run deprecated\_to\_upgrade\isometric\_game this demo(the same code), A had 60+FPS , B had 1200+FPS ，Why

A run other demo had 600+FPS, so A no limit 60FPS

---

<div class="post-metadata">

### Author: ![michalis](https://forum.castle-engine.io/user_avatar/forum.castle-engine.io/michalis/32/3_2.png) [@michalis](https://forum.castle-engine.io/u/michalis)
#### Post date: [January 20, 2023, 6:35am UTC](https://forum.castle-engine.io/t/strange-fps-difference/721/2 "2023-01-20T06:35:16Z")

</div>

Likely one has V-Sync turned on, the other not.

Please read [Optimization and profiling | Manual | Castle Game Engine](https://castle-engine.io/manual_optimization.php) for various pointers how to interpret FPS values. It says

> You will also need to turn off “_vertical synchronization_” of the GPU to achieve arbitrarily high FPS.

---

<div class="post-metadata">

### Author: ![soastao](https://forum.castle-engine.io/letter_avatar_proxy/v4/letter/s/67e7ee/32.png) [@soastao](https://forum.castle-engine.io/u/soastao)
#### Post date: [January 20, 2023, 6:51am UTC](https://forum.castle-engine.io/t/strange-fps-difference/721/3 "2023-01-20T06:51:56Z")

</div>

Thanks, I will check it carefully