I use Signal every day for 1:1 messages and a 1:2 group. There's basically no noticeable lag normally, i have very few complaints about the raw message functionality of Signal.

My complaints (if you can call them that) would be the general app quality on various platforms, and how much better Telegram feels. I'm a user that also enjoys all the stupid features that non-encrypted platforms have easier times adding. Gifs, stickers, drawing, reactions, /shrug - nothing necessary, but still.

So yea, functionally Signal works for me and my small group without much issue. It just doesn't have many Bells/Whistles.