I've been looking at ways of speeding up LR and thought to see if clearing 'History' helped.
It's unlikely this will help improve the speed of your Lightroom ... however you haven't said what actions in Lightroom are slow. The solution often depends on exactly what tasks are slow.
Most things are slow.
But all a bit variable in their treacle like nature.
I've tested all other programmes closed down, optimising, faster disks......
I did see a mention somewhere re corrupted presets. Not tried deleting and reinstating those yet.
Sorry, not helpful.
Define "most things" by being specific. Editing? Scrolling in the Library Module? Zooming?
Tell us what is not slow.
Sorry, should have been more specific. Everything is slow, sadly I could not think of an exception.
Just optimised catalogue after the History deletion and that has now freed up 2.0GB of space and LR certainly seems snappier. Yay!
Optimising has never made any difference before.
But for how long I wonder.
It's unlikely this will help improve the speed of your Lightroom ...
It certainly seems to after a catalogue optimisation. So worth a go if LR is sluggish [back up catalogue first].