There really is no reason why processing should be slower on PI4, in fact in my experience with PiCrate it is substantially faster. However I have not tried to install vanilla processing on my PI4. In my most recent release I use the jdk11 version installed by Buster, I use Fake KMS. Anyone wishing to work on vanilla processing for the PI should probably clone processing4, but try and work with the Buster installed jdk11 (32 bit hard float etc), rather than bundle the jdk in the vanilla processing way. That way they can take advantage of improvements/developments from PI side, it seems PI4 still has a few rough edges, but it is much improved since I got mine last year.
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