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New Thunderbird update is VERY SLOW

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After latest update to Thunderbird (115.4.1 (64-bit)), it's unacceptably slow. My mother also has new laptop and it's the same. Will need to migrate to Outlook if it's not fixed soon. Any help?

After latest update to Thunderbird (115.4.1 (64-bit)), it's unacceptably slow. My mother also has new laptop and it's the same. Will need to migrate to Outlook if it's not fixed soon. Any help?

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Sorry I didn’t see this. Extremely busy this week and weekend. Will try it out asap, thanks!