USSEP added a script that supposedly avoids a problem with Valdr during his quest. That script however doesn't seem to end properly and can cause performance issues due to how its implemented.
One of the (probably soon to be recommended) mods in this performance guide
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Author notes
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File credits
The Unofficial Patch Project Team powerofthree
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Changelogs
Version 2.0
This version is an extension and is not required. You can still use version 1.0.
Added feature to make Valdr "drink" the given potion, credits to Dimon.
Also added safety check to prevent the OnItemAdded event from running anytime Valdr gets an item.
Version 1.0
Initial release
Fix and Optimize the USKPdunMossMotherValdrAliasScript of USSEP using Po3's extender.
That script doesn't end itself for some reason even after completing his quest. So going near Valdr anytime will create VM (script) stress.
How to get the VM stress: 1. Get mods that give "cloak spells" to the Player. (ie. Ordinator's Illusion Perk Imposing Pressence) or just activate a similar cloak spell. 2. Go near Valdr and activate his quest if you haven't done so. 3. If you have Display Fixes and turned on the VM display, it will say that your VM is overstressed.
Optimized USKPdunMossMotherValdrAliasScript of USSEP using Po3's extender
No plugin
Version 2.0 - Added a feature to make Valdr drink the potion given to him.
[Issues]
None
[Install] 1. Install requirements 2. If in mid-game, Make sure you are not in a same cell as Valdr. Go to an interior cell without Valdr just to be sure 3. Install this mod
[Uninstall] 1. If in mid-game, Make sure you are not in a same cell as Valdr. Go to an interior cell without Valdr just to be sure 2. Then remove the script