Indexing/building performance issues

[Wezz19]

Describe the bug

• High CPU and RAM usage for the IDE process, when working on a sketch for longer than 30mins.
• Indexing and building never stops after 60+ mins
• Scrolling the editor is extremely slow and choppy after 60+ mins
• Hovering the pointer over variables never brings up additional info about them, after 30+ mins
• (The IDE has never crashed for me though, even after 4+ h usage)

(all the CPU and RAM usages are for the IDE 2.0 process)

1. (Time since IDE launch: 0mins) CPU 0% and RAM about 400MB. Indexing completes in less than 2s.
2. (Time since IDE launch: 30mins) CPU 47% and RAM constantly jumping between 1100->500MB, indexing and building sketch takes longer and longer after even the tiniest edit.
3. (Time since IDE launch: 60mins) CPU jumping between 57-49% and RAM jumping between 2300->1200MB. Memory graph in Task manager looks like a saw blade. Indexing and building never finishes.
4. (Time since IDE launch: 0mins) Saving and restarting the IDE brings the CPU down to 2% and RAM to 500MB.

To Reproduce

1. Load up a sketch
2. Edit, verify and upload for at least 30 to 60mins

Workaround
Restart the IDE every 30min

Hardware/Software

• OS: Windows 10
• IDE: 2.0 nightly 20211219
• CPU: i5-6200U
• Board: Nano clone

Additional context
Possibly related issues:
#431
#709

[IanBUK]

I'm getting performance issues with RC3 on MacOS that are resolved by restarting the IDE. I'll check to see if memory/cpu usage trends upwards.

[Zer0-bit]

Getting the same behaviour, seems like it might be related to some HW acceleration feature as when this behaviour starts and i upload a sketch the notification says "Done uploading" as usual while the terminal itself is still outputting compile data and stuff, as in the UI is waaayyyyy behind the actual process.

[Ali229]

Getting similar behavior, the IDE is extremely slow, and keeps indexing/building and take system resources while doing it, during this time the IDE stops error checking or keeps showing error on code that has no syntax errors. For now it's so slow and unusable that I have to use another IDE to write code, when I'm done I copy it to Arduino and compile!

[IanBUK]

I’ve gone back to version 1.8.3 of the ide. Yes, I’ve lost all the new features, but at least it doesn’t slow down so much.

This is a real barrier to release.

[IrregularShed]

I'm in the exact same situation unfortunately. I don't like using the old IDE because it's not got many of the niceties that I've grown to expect over the past decade with other IDEs and editors (VS Code really spoiled us) so it slows me down; sadly the new one slows me down in another way.

[peter76]

Same problem here on Fedora linux; editor turns unbearably slow after 50 lines of code or so; just keeps indexing and intellisense stops working. VS Code works like a charm with the arduino extension installed.

Just to sort out some misconfiguration, I added a new user on my system and ran a freshly downloaded ide from there, same problem.

Let me know if I can do something to look into this, the ide looks promising, but is unusable as it is:-(