Last firefox, but problem stay in safe mod and after cleaning cookies.
Hey @safa - can you read through the following help doc and make sure that your board doesn't have too many open cards / checklists / attachments? https://help.trello.com/article/1089-troubleshooting-a-slow-board
If that doesn't help, I recommend raising a ticket with Trello Support at https://trello.com/contact
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