Created attachment 8865340 [details] doc.7z User Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:53.0) Gecko/20100101 Firefox/53.0 Build ID: 20170504105526 Steps to reproduce: I've created a zip file of 5MB and sent it to my mail. I've then tried to preview/open this message from my inbox. Actual results: Thunderbird takes 6 seconds to preview or open this message. Expected results: In previous version I've never seen such a slow behaviour. It was as fast as if it didn't have any attachment. I think it has been introduced in 52. Attached there is the file used for the test
Sorry, my fault. It simply was Look-Out plugin. Disabling it solved the problem.
(In reply to kidservice from comment #1) > Sorry, my fault. > It simply was Look-Out plugin. > Disabling it solved the problem. Thanks for the update
Status: UNCONFIRMED → RESOLVED
Last Resolved: a year ago
Resolution: --- → INVALID
Whiteboard: [addon:LookOut ]
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