ITR performance and sound loss in hot weather

so I know au net, maybe I also spin (what I hope in this case), but it seems to me as if the performance of my ITR is weakening a bit at the moment, especially Saturday and Sunday. especially in the vtec area, also the vtec sound seems a little weaker than usual. I know that hot air costs power, but it seems a bit bad to me. it’s also my first summer with the ITR.