BrowserAssist "var management" can't make miracles even/specially if you were choosing, with BrowserAssist, to temporary apply some "ruleset". Maybe that's why you see items, scenes etc. "disappear"... but you can always solve the problem you mentioned with applying "All Enabled"
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The most simple and efficient solution to general vam-load-time problem is to keep your vars folder (more or less) around 100/150GB. Maybe it looks too much minimal, but if you do so, even with a modest desktop pc you will have a good fun and practically no issues.
The bastard, banal "secret" to get never time_load issues, besides trying to use (like you did) those very "opinables" browser-assist "rulesets" options is to
delete always those trashable-vars you are 100% sure you will never use (because you do not like/need them). The alternative can be to save a list with all those poor trash-vars in personal dedicated (trash)folders, if really you feel so badly nostalgic and you hate deleting them forever.
p.s.: I am sorry if I was unintentionally upsetting "talented" creators, my main installed Vam is actually "just" 130GB (ok, that's also because, for my personal motivations, I moved away the heavy vam-cache in a different nvme disk...)... so yes,
only (?!) 130GB, but I feel guilty for having still not deleted a lot of vars I never use, I am also a little nostalgic.