My obsidian is working way too slow

Right click the shortcut, select Properties and add the following to the beginning of the Target box:

%windir%\system32\cmd.exe /c start /high

As an example, a shortcut to notepad will look like this normally:

%windir%\system32\notepad.exe

Adding the above will make it:

%windir%\system32\cmd.exe /c start /high %windir%\system32\notepad.exe

This should work for most programs. Mind you, Obsidian has multiple processes running, so in Task manager you can go into processes and manually change priority on the highest CPU process as well.
I am usually on Linux now and generally I am trying to strip down my Obsidian as much as possible.

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