Running a script on the Piano Roll takes way too long to respond #1106

Describe the bug
Running a script from the scripts menu on the piano roll takes ages to respond. When you run a script such as humanize, it firstly asks if I want to run it only for selected notes or for all events in the track. When I confirm this, it takes like half a minute to display the dialogue and when I confirm on the dialogue, it takes another minute to run it on a single track. An equivalent feature runs nearly instantly in other pieces of software. Even the script "do nothing", which I guess is there for debugging, takes too long to respond.

To Reproduce
Steps to reproduce the behavior:

1. Import some MIDI file
2. Open one track on the piano roll
3. From the menu scripts, run a script for all note events in track or for a selection. I tested with humanize, do nothing and randomizeVelocityRelative.
4. MusE 4 freezes and it takes too long to respond.

Expected behavior
To respond nearly instantly. It should no more than running a loop over a couple of thousands of elements.

Desktop (please complete the following information):

• OS: Ubuntu 22.04
• Desktop MATE 1.26.0

Additional context
Machine: Acer Aspire V3 772G with 24 GB RAM installed
Intel i7 4th gen 2.2 GHz