To eliminate plugins and customisations you could install a fresh portable on a hard disk and drop a symlink to your library into it. Then see if VL switching is faster on that - FWIW Ctrl+Left and Ctrl+Right arrows can be used to switch VLs.
My previously mentioned 8500 media library has 20 columns in the View that I use most often - sixteen of which are custom columns - none are made via a template.
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