https://connect.mozilla.org/t5/discussions/thunderbird-is-exhausting-memory-why/m-p/53176#M18885 <P>Hello community, i am asking myself why the heck Thunderbird is eating up the memory of my MacBook. When i look at the distinguished memory use it show me between 695 and 745 MB of RAM that is beeing used for Thunderbird. I am using 115.8.1 and i really dont see (or agree) why a "normal email-app" need to use that much memory?</P><P>Ok, i have to admit that i really keep many eMails stashed up in folders (lets say a few thousand as used for business) and i also use the calendar heavily.</P><P>But still. If i compare that to Apples iCal plus Apple Mail (which would be the alternative apps) those use&nbsp; about half of that amount. So how come? Is there no chance to reduce that somehow?</P><P>Sure my MacBook holds 8GB of RAMs but still. When you work with many ProApps and compare their RAM-usage Thunderbird makes a real bad figure against them.... So whats going on here?</P><P>Any help out there to reduce this memory ripp-off?</P><P>Best regards, Chris</P> Sun, 10 Mar 2024 22:51:16 GMT chrilard24 2024-03-10T22:51:16Z https://connect.mozilla.org/t5/discussions/thunderbird-is-exhausting-memory-why/m-p/53176#M18885 <P>Hello community, i am asking myself why the heck Thunderbird is eating up the memory of my MacBook. When i look at the distinguished memory use it show me between 695 and 745 MB of RAM that is beeing used for Thunderbird. I am using 115.8.1 and i really dont see (or agree) why a "normal email-app" need to use that much memory?</P><P>Ok, i have to admit that i really keep many eMails stashed up in folders (lets say a few thousand as used for business) and i also use the calendar heavily.</P><P>But still. If i compare that to Apples iCal plus Apple Mail (which would be the alternative apps) those use&nbsp; about half of that amount. So how come? Is there no chance to reduce that somehow?</P><P>Sure my MacBook holds 8GB of RAMs but still. When you work with many ProApps and compare their RAM-usage Thunderbird makes a real bad figure against them.... So whats going on here?</P><P>Any help out there to reduce this memory ripp-off?</P><P>Best regards, Chris</P> Sun, 10 Mar 2024 22:51:16 GMT https://connect.mozilla.org/t5/discussions/thunderbird-is-exhausting-memory-why/m-p/53176#M18885 chrilard24 2024-03-10T22:51:16Z https://connect.mozilla.org/t5/discussions/thunderbird-is-exhausting-memory-why/m-p/122687#M48258 <P>I agree. I have 16 GB and in Task Manager Thunderbird 148.0 is using 510 MB in 5 processes</P> Mon, 13 Apr 2026 05:09:50 GMT https://connect.mozilla.org/t5/discussions/thunderbird-is-exhausting-memory-why/m-p/122687#M48258 JRHeisey 2026-04-13T05:09:50Z