SUMMARY STEPS TO REPRODUCE 1. Have a long back and forth email thread 2. Attempt to reply 3. OBSERVED RESULT After the thread grows, opening it in the editor and just typing in the editor becomes painfully slow. The system I am running this on is a 12 core AMD Threadripper with 128GiB of RAM with NVME storage. The thread that is currently giving my grief is 16 messages deep and is 5616 lines long. EXPECTED RESULT There should be no long delays. SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION