Yeah... modern graphics cards have really limited text mode implementations and even worse, often broken ones that don't display the correct colors even (can find many complaints of those running "classic" games etc). There are/were a LOT of basic text modes that were supported up until they were largely deprecated and only very basic implementations exist now... and often are slow to render walls of text. It's kind of wild.

No idea if op refers to that. I don’t think so, but modern stack can be ineffective.

My work mbp M1 was having a delay writing text in external monitor

While all the rest, including vidéo, was display without delay.

I had to tweak some driver settings ( of the base , not my graphic card )

Yes, much much faster. The 7600GT will do about 900k characters per second (stock) or 600k at 160x60 using ter-u20b font. Last time I tested, a GTX580 does about 187k per second but that's in stock 80x25 VGA mode without a framebuffer; to get a direct framebuffer the only option I'm aware of is nouveau, and that drops the rate to about 14k per second (so only just better than the equivalent of 1FPS at 160x60, as thast's about 10k characters on screen at once).

Some of the kernel changes that are happening may well make it possible to have simple high-speed framebuffers that can be used for text consoles in the future, so there's still hope.

Reading commends like this makes me so grateful I never got into the whole terminal deal and grew up coding on shitty computers.

In my blissful ignorance I could produce just as much effective code on a VNC machine competing with a 1080p Netflix stream on a rural DSL line as I could on a local machine in TTY mode.

The brain is really amazing at what it can adapt to, when I'm typing in a laggy situation it's like "see" the output of what I've typed before it's on the screen and end up being comfortable doing stuff like fixing a typo before it's even been reflected on the screen