I dont personally use it but i've been told this cfg is good:
-high -nod3d9ex -nojoy -nohltv -preload -nosteamcontroller -processheap -novid -useforcedmparms -malloc=system -USEALLAVAILABLECORES -windowed -noborder -w 2560 -h 1440 -particles 512 -softparticlesdefaultoff +exec autoexec.cfg...