That's kinda a thing with Decal at the moment. Decal windows are slow because the way they were implemented was a stopgap measure to get Decal released after ToD.
Decal HUDs are not affected, and there are plenty of HUD-based plugins around now. IIRC, AC+ and GoArrow both have extensive HUD systems...and of course my beta bundle. If you want LTX though, you're kinda out of luck.
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