# Variable dt causes game to run twice as fast (DEF-3146) (SOLVED)

**URL:** <https://forum.defold.com/t/variable-dt-causes-game-to-run-twice-as-fast-def-3146-solved/15827>\
**Category:** Bugs\
**Created:** [January 16, 2018, 2:20pm UTC](https://forum.defold.com/t/variable-dt-causes-game-to-run-twice-as-fast-def-3146-solved/15827 "2018-01-16T14:20:49Z")\
**Posts on this page:** 1\
**Showing post:** 32

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**Author:** ![totebo](https://forum-defold.b-cdn.net/user_avatar/forum.defold.com/totebo/32/36087_2.png) [@totebo](https://forum.defold.com/u/totebo)\
**Post date:** [November 8, 2018, 11:15am UTC](https://forum.defold.com/t/variable-dt-causes-game-to-run-twice-as-fast-def-3146-solved/15827/32 "2018-11-08T11:15:33Z")

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So I’ve thoroughly tested this on a number of devices loading a Facebook Instant game. On iOS devices there is an initial 1-2 stutter, where framerate drops/frames are skipped. After this period it stabilises and runs smoothly.

After removing culling code I was running every frame, my game also behaves like above. I’m starting a new topic for that here: [To cull or not to cull](https://forum.defold.com/t/to-cull-or-not-to-cull/34221)

Thanks!

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