[amatic]

Do they also use assembler in HFT?

[defrost]

Custom hardware, custom drivers, custom UDP stack.

It's not just the algo's, it's very much the latency.

( eg: https://www.velvetech.com/blog/fpga-in-high-frequency-tradin... )

[SkipperCat]

For speed, its mostly FPGAs. You can put them directly at the demarc between you and the exchange.

[IshKebab]

They use custom ASICs too.