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ERJ 145 v2: dramatic FPS drop whilst rolling on ground


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I have a fresh install of FSX-SE with the but am seeing a very weird FPS problem specific to the ERJ-145 v2 whilst moving on the ground.  As soon as I get above 1KT the FPS drops dramatically (from 40-50 FPS to 20-30), but jumps back up again the moment I leave the ground.  I've tried running with clear skies to avoid clouds sapping any FPS but the problem persists and it seems specific to the ERJ 145.  I can't understand why it should just be happening on the ground, and why it is fine while the aircraft rolls gently at <1KT but kicks in at anything greater.  Has anyone else experienced/reported this issue or any ideas why it might be happening?  With clouds and payware scenery/airports I suspect the FPS drop will make the ERJ unusable.

System specs:  Intel Core i7-4790K @ 4.00GHz, 16GB RAM, nVidia GTX 960 (2GB), Windows 10 Home 64-bit.

Thanks in advance for any help anyone can provide - I'm stumped!


Edited by ajc712
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