World of Warcraft is stuttering in crowded cities on my Biostar H310MHD3 due to I/O blocking, any fix?

This motherboard is basically a relic; the fact that World of Warcraft could push the I/O to a total meltdown is just ridiculous. Whenever I entered Orgrimmar, disk response times would spike over 500ms, and the game turned into a literal slideshow. I wasted time running every disk defrag tool I could find, but it just added more write load and made the system even more sluggish—totally amateur move on my part. I decided to go nuclear: I forced a global TRIM command via CMD and enabled the forced write cache flush strategy in Windows performance options. In the Resource Monitor, I saw read speeds climb from a shaky 150-300MB/s up to a solid 450-520MB/s. My boot time increased by about 12 seconds after the change, but disabling useless startup apps brought it back. The drive now stays between 38-46℃, and the fans are humming along at 1400-1600RPM. It's not a powerhouse, but it's finally playable.