Very bad debugger performance

[NKarolak]

Describe the bug
Likely depending on the object that the debugger is currently in, the startup, loading of variables or moving to the next step takes a very long time (10 seconds), making it unable to use.

According to #5882 (comment), I've created a DebuggerServices.log with a verbose log level.
I will pass it personally to @kalberes, because it contains fragments of our IP.

Versions:

• AL Language: 6.6.425415

• VS Code: 1.54.1

[NKarolak]

@DTKB Did you encounter this as well?

[dzzzb]

Yeah, I have noticed some quite long delays. The BC client freezes up, and VS Code starts to flash in the taskbar that it has something for me - both in fairly normal times - but then I have to sit and wait while VS Code realises that it needs to focus a particular file/line and show the debugging info for it. I didn't yet investigate to ascertain whether it's universal or affected by any particular features of projects.

[NKarolak]

In my case, it seems to be related that the initial variable loading takes lots of time. The debugger itself opens quickly, but when you try to open any of the variables sections (e.g. Locals), you only see some progress indicator ... Wait 10 seconds until it's loaded, then you continue with the debugger, but that variable problem repeats in the next step. Really weird.

[kalberes]

Looks like in case of Natalie, RecRef.GetTable has severe perf issues resolving AL variables from the associated(codegened) .net variables.
I will investigate it as far as I have some time.

[NKarolak]

My issue is currently on hold due to another extension (see automatic comment above). I will update or close this case as soon as possible.

[martonsagi]

Hey, this issue was caused by a custom Reference provider in AL Studio extension, the provider ran excessively in debug mode. I have fixed the issue with the help of @NKarolak

[kalberes]

@NKarolak , @martonsagi
Thanks for the info.
Maybe we need to update our template that when something is reproduced then it should only be with MS based AL extensions.