srry can’t help you here, 8 days till launch and many many people can’t even play the prepatch. I have 60 fps on dx 11 legacy, 33 on dx 11… like what the hell have you done blizzard.
SLI isn’t actually supported by our games (including WoW), and generally only provides negligible performance benefits (if even that) when it works at all. The mentioned script command is also not advisable - a hotfix a while ago already made this the default setting, meaning the command isn’t necessary anymore.
Beyond that: the system requirements for WoW in patch 10.0 (which effectively is now running on the Dragonflight engine) are a fair bit higher than they were in the previous expansion, so a dip in effective framerate isn’t exactly completely unexpected. With that in mind, we have seen some pretty performance issues that were caused by addons that aren’t suitable for the current version of the game, so clearing those out fully has proven highly effective for a lot of players!