There's a lot of trading that isn't proper "HFT", but where speed and latency still matter. Often you'll find this employed more as slippage reduction - i.e you're going to make the trade either way, but making it faster saves you a few bps.

I'm not sure what event-based traders are doing now, but back in the day NLP sentiment analysis was all the rage, so I'm assuming they've now incorporated LLMs too.