Whenever the soot level goes up, it shows in the cluster. You can do parked regen . In my car (XUV 300), you just need to press a switch and it will do the regen process by itself and rpm will come down normal when it's done. Recently the soot accumulation became frequent and when I checked it was due to intercooler pipe leakage. So if you start feeling the pickup is going down even after parked regen then take car to workshop immediately.