Not sure if this is just a design flaw, or an actual bug.. but if you salvage enough items.. over time you’ll get fps lag until you relog.
https://youtu.be/zt0lDLcgU38
Edit: Also posted over on https://www.reddit.com/r/Guildwars2/comments/6o9pa9/bug_salvage_all_gets_slower_and_slower/
This Guild Is Fire [PRUF]