Enhanced table rendering performance #285
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Following the bug fix in #278, there may be a route to improving table rendering performance as per #68.
This is a first attempt at "performance tests" that attempt to:
I did one "fixed" time test of 100k cells. Present master takes approx 72 seconds; 278 takes approx 20 seconds; and once the tests are passing they will consume less than 4 seconds.
The rest of the expectations merely check to ensure that the rendering time is not increasing substantially while a larger table is rendered after and compared with the previous rendering time.