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If it is neither the file system nor registry accesses, then you could try to debug the Delphi IDE (with another Delphi instance) and pause the debugged IDE while it is taking its time to save the project. Then you can switch to the main-thread and look at the call stack to find out what the IDE is doing. How to debug the Delphi IDE itself.

Sysinternals tools may give you a clue as to what is happening. Process Monitor filtered on the Delphi process will show you if the active thread is busy accessing the file system or the registry, and Process Explorer will display the active threads of the process and can snapshot the stack of each one - it can show much more information about the process than Task Manager.

The CPU sitting at 13% probably means that something is using one core at 100%. So I would not subscribe to this view: Have you tried to disable all IDE extensions to check whether it is caused by one of these?

Hello, As you are reading this message, you probably use ICS. Good! But have you taken time to register your ICS copy? ICS is freeware but to use it, you must register it. Registration is very simple: just mail a [real, paper] picture postcard to the author (me). You can find instructions in the readme8.txt file in ICS distribution. Thanks. PS: If you already sent your picture postcard, simply ignore this message. If you want to know if I received it, then you must tell me by email when you sent it, from which country and what the picture look like (I have several thousands postcards!).

Pfft! You did ask for opinions, did you not? For me the use case would be that I'm either looking for TODOs or I'm focused on something else. If I'm looking for TODOs then the existing functionality is just fine. If I'm focused on something else then I'll read the comments anyway and I don't need the extra distraction.

My bet would be cloud storage: Try disabling iTunes, GDrive, OneDrive, DropBox etc. if you have them. For some reason these don't show up in Process Explorer (probably because they work on a too low level), but in my experience they can completely kill system performance. Every so often members of my family will ask for a new computer because it's gotten so slow they can't use it. I've tried, in vain, to explain to them that hardware doesn't get slower with age (my main workstation is actually the oldest in the household) but they persist. So I just uninstall or disable the various cloud storage services they use and just like that their system runs like new again.

No. With LSP tools like VS Code and many other editors will offer error insight, code completion and some other services for Pascal language. But this: When (if?) these plans become reality other IDEs will be able to offer debugging for Pascal language. IDEA with I-Pascal already supports LLDB. I hope the language support in LLDB will be better than in GDB otherwise debugging experience will resemble one from Lazarus.

Worth watching for insights into the value of a language server: