Hello there We have read the question We try to help

The pc is slowing down or the system?

Thunderbird is slowing down after clicking on the icones or mail items , oké the reason that the program is slowing down that there might be some double software is going around on the recent desktop ,try to find the double installations and remove these to the trash and clean the trashcan.for the hardware could it be the use of the hardware acceleration button that slows down all and turning it to an option so you can use it to switch it on or off .

Restarting the Thunderbird program in troubleshoot mode formerly safe mode try to disable the add ons and try to check if the program runs oké there now can be some wrong bad addon or extension that went there that might not belongs there , try to remove the bad add on from the program.

Restart the operating system of the pc with safe mode with the networking option that is on the pc with the win or mac system search for installation restart on that pc and check if there is some software program that is bothering the complete system of running it s system. Remove the unwanted pc software from it.

This tree steps can speed up the complete system include the other software that you use recent.

Other symptoms as overloads of intern mail in the inbox and overloaded maps could slow down the progress of them.The internet connection is weak and online moments are there with a poor service could cause this to.

Greetings Firefox volunteer

Hello there

https://support.mozilla.org/en-US/kb/troubleshoot-mode-thunderbird

Answering the issue Yes there are software programs that can runs on high ram performance on a pc that runs on your pc win or mac installations yes with the software and usage of a high memory can slow some of the entire pc.

Is there a good WiFi connection? Sometimes time outs appears but they come with a error pop up.

Greetings Firefox volunteer .