Form with (around 100 instances) of a repeat running very slow

I have a form with a repeat section that has 5-6 questions. This repeat section is repeated around a 100 times (upper limit). The form rendering is slow, and saving the form in every step of the repeat instance is very slow as well.

Is ODK collect not able to handle, or is it totally device-based (memory/processing of device). I have a low-end device for the study.

Also, could it possibly make a difference if I had 10 different repeat with 10 repetitions, instead of 100 repetitions in a single repeat?