Simply add "LD_PRELOAD=/usr/lib32/libtcmalloc_minimal.so.4 %command%" to your game arguments and run it, if you don't have libtcmalloc installed, install the one provided by your distro's package management.

I usually add mangohud and gamemode to it as well, so mine looks like this:
"LD_PRELOAD=/usr/lib32/libtcmalloc_minimal.so.4 mangohud --dlsym gamemoderun %command%"

The game runs fantastically after doing this.