Read this, found 2 pieces of 1/4" thick plex, put them in my 80w Chinese Triumph--
it DID get thru in one pass, but had to get down to only 4mm per second to do it, and a little slower yet would've likely gone thru better-- that's slow, roughly 6-1/2 seconds per inch. That works out to just a hair more than 5 minutes to cut a square foot--

But, still better than NOT cutting it I guess!