This will be my last project ever with WordPress. Seems like they added a site "customizer" (wysiwyg) which looks fancy and all, but after a few minutes configuring options the customizer starts lagging, fan starts getting louder, CPU & RAM go up so I do some profiling on that page:

Full layout repaints on every mousemove event, mem usage starts at 125MB and goes up up up to even 200MB while staying idle.. wtf? How did this even get shipped?