Thanks. I think the reason it worked before was that I compiled it with Device OS 1.4.4 - I just tried it again and I got a load of warnings but it works. I can fix the warnings. With OS 1.5.0-rc.2 a pile of odd errors.
I tried the pinSetFast / pinResetFast in SPITFTMacros.h and SPITFT.h and it didnāt seem to change anything. Still scratching my head.
Me too. The SPITFT.h/SPITFT.cpp are a real ārats nestā IMHO. Could it be that the performance is so slow because of the abstraction that SPITFT introduces into the use of SPI for these devices?
Well, after trying every tip I could find here and elsewhere on the internet, Iāve given up on this. Clearly Iām going to have to dig deeper than I have time for right now, and a complete revamp of Adafruit GFX library isnāt really on my radar. For future reference for anyone interested, here are the benchmark results:
@aklein24 Thanks for sharing this - if I get some time I will have a go at a radical rewrite of the SPITFT and see if I can cure this issue with the HX8357!
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I fully support this effort 
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