simple approach for a speedup
simple approach for a speedup

simple speedup. More speedup the larger the font, but is faster for small fonts too.
An even better approach would be to use drawFastHLine, because there are more vlines in normal fonts(???)
kirberich/teensy_ssd1351,kirberich/teensy_ssd1351,kirberich/teensy_ssd1351,kirberich/teensy_ssd1351,kirberich/teensy_ssd1351