I also changed location where you should add code, it's in the first post.
Also, you should now that what you're experiencing is the way your browser handles HTML, or just problem with speed with your computer.
For example, in my browser collapsing on and off is instant. Try it with different browser, or on different computer.
From code perspective, there's nothing that can be done to speed it up (and it is fast). It collapses as speedy as any other collapsing object within vB.
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