Thunderbird Performance Tuning

References

• https://wiki.mozilla.org/Thunderbird:Testing:Memory_Usage_Problems

Network

IMAP connections

• NOTE Turn off global INDEXING before you do anything else!!!!!
  • Tools -> Options -> Advanced -> General -> Advanced Configuration -> uncheck "Enable Global Search and Indexer"

Speeding up IMAP

• Open Preferences -> Advanced -> General Tab -> Config Editor
  • In the Filter section type max_cached_connections
    • enter 1 for all entries that are highlighted
• Turn off automatic offline SYNC for the new account profile BEFORE migrating email - each profile has it's own settings
• Turn off global indexer BEFORE migrating email - best leave it off forever

Working with Connect

• Open Preferences -> Advanced -> General -> Configure Editor
  • In the search box type: mail.server.default.fetch.by.chunks
    • set to false
    • This will fix a problem where large files (eg: pdfs) are not fully-downloaded and appear corrupted
  • In the search box type: mail.server
    • increase timeouts to 100

Resource Usage

• Folder Size Reporting Tool