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Assetto Corsa 1.3 brings a multithreaded physics engine which takes great benefit from multiple cores CPUs.

Unfortunately dual core CPUs might have performance issues with a high number of opponents and there is no easy workaround about that. We just recommend to upgrade to a multicore CPU even if it has a lower single core speed.

If you still have a dual core CPU, try setting

[THREADING]
USE_TIMER_PROCESS=0

in the assetto_corsa.ini file located in your Steam folder\steamapps\common\assettocorsa\system\cfg