I'm having a problem with my macbook pro m1 pro, when I turn it on it starts to run slow and when I open the activity monitor I have at least 10 processes called "System/Library/Frameworks/WebKit.framework/Versions/A/XPCServices/com.apple.WebKit.WebContent.xpc/Contents/MacOS/com.apple.WebKit.WebContent" and "WebThumbnailExtension Web Content" I don't know what this is, I can't find a solution.
MacBook Pro 14″, macOS 15.0
The issue for me was that some files synced by office ( probably outlook ) were causing this to happen whenever spotlight tried to index them. Maybe its the icon generation of .xls files like someone mentioned in this thread, but I can't 100% confirm that either.
The way I fixed it was to exclude all Microsoft Office folders from spotlight indexing. The ones starting with "UBF8" inside of "/Users/username/Library/Group Containers/".
Sorry it wasn;t this after all. Still do not know what.
FYI I had planmaker free open with safari doing copy and paste of web content into a spreadsheet.
sounds plausible and would match my experience as described before
"....I believe there is a bug in the ICON PREVIEW generation for .xls files." seems correct
interesting, I tried your solution after returning to office but does not work for me, unfortunately.
WebThumbnailExtension 100% cpu usage
