I made the sketch below for a GPS clock. It runs correctly on the Serial Monitor. However, at the LCD display the seconds do not change smoothly. They sometimes stand still for a couple of seconds, then catch-up correctly. As in this example with a number per second: 10 11 12 12 14 15 16 …

Sketch does not update LCD properly - Solved

nfoldager February 27, 2024, 3:30pm 4

However, I wonder why the changes on the display are slowed down by faster update.
?

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