FTR - last evening my time, I ripped the custom columns out of jnikkir's library. That had some effect but it was still slower than I would have expected, given the one column sort sequence didn't change and VL switching was instant.
@JimmXinu - I'll do some tests of the new VM plugin in my 5.38 install, and when Kovid posts a new portable 5.99 beta I'll test it under that too. Be interesting to see if the small delays I get with VM switching are reduced, I've assumed they were due to my multi-column sort sequences - which are my raison d'être for using VM.
@jnikkir - thanks for your cooperation & perseverance, without it the 'bug' would not have been fixed.
BR
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