No first hand experience, but I do have a temperature sensitivity chart.
Over a range of 125 degrees F RL-15 came in at 50 fps and IMR 4064 at 46 fps, so about the same.
To put this in some perspective, H4350 was 4 fps, best and IMR 4895 was 166 fps, worst.
Unfortunately I have lost the date and source of these data.