setFontCustom bitmap format vs vertical_byte:true - GT24L24A2Y fontchip in F07 fitness tracker

also with clean device

>var s=SPI();process.memory().free
=2575
>for(var i=0;i<2000;i++)s=SPI();process.memory().free
=570
>E.dumpFragmentation()
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=undefined
>

EDIT:
same with s=Serial() or s=I2C()