I have several Tuya based PIR sensors. I have them connected to home assistant via the Tuya smart app and while they do work, they are very slow. That is to say that it can take anywhere from 1 second to 10 seconds before the state changes. I don’t know where the problem lies - it’s definitely not my signal strength.
Is it possible to connect these PIR sensors directly to HA?
What model/product is it 
What technology? Wifi? Bluetooth? Z…? X…? Y…
How are they powered? Batteries? Wired
Hardly can any one else with the little information you provide… It might be just the ordinary sh*tty tuya stuff which communicates over wifi but being battery powered at the same time causing heavy lags because it just takes time to establish a encrypted wifi connection (4-way-
) as well establishing the TCP/IP connection which might include some DHCP negotiations too… 
Maybe even send your motion detection ones around the world (over other peoples computers AKA cloud 
) before finally reaching your home (again) and “dropping” the detection event in HA 
But to know it you should really (try) to ask a good question and delivery at least the basic information 
This thread might be a good read for you @impy101 
It’s a WiFi PIR sensor, its powered both wired and wirelessly (2x AAA batteries). I don’t think it’s a known model or anything. It’s a cheap PIR sensor from China that came in generic little boxes.
So my assumption was probably on point
As I was not the first one suggesting you (@impy101) how to ask a good question you might really want to take some minutes and read that post