IMAP is Terribly Slow

IMAP is Terribly Slow

I have decided to move a bunch of mailboxes to Zoho and fired off imapsync to import emails.

From the same source mailbox (Amazon WorkMail), this is the speed I get transferring to:
- Zoho: 0.3 email/second
- Infomaniak: 14 email/second
- Gandi: 22 email/second

A transfer which should take no more than one hour has taken about 60 hours. I'm running the transfer from a datacenter (so I'm essentially not capped on bandwidth) in Europe, to Zoho EU. To exclude even that variable I've now started a backup (using offlineimap) of my Zoho mailbox and it's taking 3/4 seconds per email too.

By searching "slow IMAP" on this forum a ton of threads come up but support representatives seem to be consistently blaming this on the end user. I know for a fact this is not an issue with the source (same source to other destination goes pretty fast), nor with the intermediate node running the transfer (I used two different ones in DCs which are local to Zoho: Dublin and Amsterdam), so the problem must be in Zoho.

Is there some sort of deliberate throttling at play? Has anyone analysed this any deeper?

I'm pleased with Zoho's spam filtering so far and would love to not have to revert my migration.

Thanks!




                            Zoho Desk Resources

                            • Desk Community Learning Series


                            • Digest


                            • Functions


                            • Meetups


                            • Kbase


                            • Resources


                            • Glossary


                            • Desk Marketplace


                            • MVP Corner


                            • Word of the Day



                                Zoho Marketing Automation


                                        Manage your brands on social media



                                                Zoho TeamInbox Resources

                                                  Zoho DataPrep Resources



                                                    Zoho CRM Plus Resources

                                                      Zoho Books Resources


                                                        Zoho Subscriptions Resources

                                                          Zoho Projects Resources


                                                            Zoho Sprints Resources


                                                              Qntrl Resources


                                                                Zoho Creator Resources


                                                                  Zoho WorkDrive Resources



                                                                    Zoho Campaigns Resources

                                                                      Zoho CRM Resources

                                                                      • CRM Community Learning Series

                                                                        CRM Community Learning Series


                                                                      • Tips

                                                                        Tips

                                                                      • Functions

                                                                        Functions

                                                                      • Meetups

                                                                        Meetups

                                                                      • Kbase

                                                                        Kbase

                                                                      • Resources

                                                                        Resources

                                                                      • Digest

                                                                        Digest

                                                                      • CRM Marketplace

                                                                        CRM Marketplace

                                                                      • MVP Corner

                                                                        MVP Corner

                                                                      





                                                                      




                                                                          Design. Discuss. Deliver.

                                                                          Create visually engaging stories with Zoho Show.

                                                                          Get Started Now