eM Client on a computer (Windows, Mac) is fast when it comes to checking five email accounts.
However, the mobile version is slow with the same five accounts regardless of the platform (android phone, android tablet, iphone). Why?
What version have you got ?
Running the latest update on every device. Looking at my android phone, it shows v10.0.1710.
Running the latest update on every device. Looking at my android phone, it shows v10.0.1710
The PlayStore version does have speed issues, which is way quicker in the Beta Droid v10.3.2269 which also now includes the Calendar, Contacts & Tasks etc.
If you would like to try the later Beta Droid or iOS version, you can “scroll down in the eM Client app PlayStore page” and click “Join the Beta” or if you have iPhone open the “Testflight app” and join as per the eM Client Mobile Beta webpage link below.
https://www.emclient.com/mobile-beta-faq
If you have any problems or questions with the Beta, you can email [email protected]
Lastly from reading this forum threads the release mobile version isn’t far away now.
Using the beta version. It seems to be a lot more responsive. No complaints.
I have had the same experience, and support for the mobile client is lacking, the font size for example makes it to large. As you said its really slow and does not seem to be able poll for email unless it is the active app then you get the full slowness. I love the mac version the client not so much, I sadly went back to apple mail.
Mobile side has always been extremely slow
I am on iOS. I stopped using eM Client for awhile because it took forever to download email with a solid WiFi or 5G UW connection.
Tried to use it on iOS 26 this week and you can’t even delete mail. I’ll give eM Client a pass because the OS is still in beta (DB 9)
The latest eM Client mobile iOS Beta “Testflight app” V10.3.3292 has alot of fixes and seems to work really quick for me personally on iOS 18.6.2 using my M1 Ipad & iPhone 13 Pro Max.
It also now has “Calendar Notifications” as well and does receive Mail and Calendar notifications when running in the background.
the font size for example makes it to large.
You can adjust the mobile app font size via pressing “Menu / Settings” and press on Appearance under Preferences where there is a Font Size slider.
I get the same issue on iPhone 17 pro (but it’s existing for me, since I use emclien iOS app).
Synchronising emails is incredibly slow and the search function usually doesn’t work. Results are found very slowly and are unfortunately incomplete (I get significantly more hits on my Mac (no local data).
What am I doing wrong? I’m using version 10.4.4205 and iOS 26.2.
Same here, on iPadOS, the progress wheel on top circles forever until the first new message arrives.
My Android smartphone syncs and shows unread mails almost instantly. Using FairEMail, though.
Both clients have 6 mail accounts configured.
Same here, very slow to import mails (iPhone 13 Pro, iOS 26).
The Mac client runs beautifully, bought a one year subscription yesterday but since I want to use the same client on both Mac OS and iOs, I am considering asking for a refund since the iOS app is not usable at all…
If you are having issues with the mobile app and you just bought a subscription and installed the app, then suggest to go to the VIP support page and login and lodge a support ticket for assistance.
We might also be able to help on this free community forum “if you can elaborate on not usable at all”.
Need more info on the actual problem and what type of mail accounts you have and any errors. Also if you used the QR Export from the desktop to the mobile app when you setup the mob app.
With not usable, I mean : the progress bar at the top keeps on running when importing mails for the first time.
I have two Gmail accounts, a Yahoo account, a Microsoft 365 account and two other IMAP accounts. All of the accounts containt not more than 150 to 200 mails, except for one Gmail account which contains thousands.
I have tried to manually configure the mails, as well as with the QR code from the desktop client, all with the same result. All mails from the desktop client are in the iOS client but loading takes forever (after 8 hours, only a fraction of the mail has been loaded)…
I will try the VIP support page…
If you have thousands of messages in a Gmail account yes that can take time to initially sync locally depending on the speed of your internet connection and also depending on if you have the account set to download messages and attachments offline or only the message list.
My own Gmail account took initially eg: 2 days to fully sync locally as I had over 100,000 messages set to download messages offline. But I could still send and receive message while it was synching.
You can check IMAP account sync download options in the mobile app by pressing “Menu / Settings”. Then “open your account” and scroll down to Services and press on “IMAP”.
Then scroll down to “Sync options” and press on “Customise download options” to sync either just the messages list. Or full messages without attachments. Or full messages with attachments.
So “if you are only synching the message list” on that Gmail account, then it’s probably just means you have a lot of messages and will take time.
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Apart from “customising the download” options, you can also speed up the initial message sync time “if you don’t set it to All Time”.
So you can adjust the message sync time from 1 day up to a year if you don’t want to sync all time
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On IOS (latest IOS, latest Em Client app).
2 Gmail accounts (not huge, less than 1000 emails, around 1 GB of storage each).
4 IMAP accounts (very, very small each).
3 POP accounts (also tiny).
I get instand push notifications for new emails - faster than the native IOS mail app and Gmail app.
But when I open the Em Client app, it takes around 30 seconds if not longer to sync and properly marked read emails if I read them on the desktop (while two desktop Em Client instances sync practically instantly).
So the app feels a bit… high inertia - is that the right way to explain it? 
I can open and send email replies without problems.
But Gmail and native IOS apps are a lot swifter - the difference is very noticeable.
Search is unusably slow (on desktop it is very fast).
It has been a few days - I did configure it to store all the emails locally, for faster search and use in general. Maybe it just needs a few more days - we’ll see.
Relja
Yes - thank you very much!
That solved the search speed right away (makes sense when you think of it, especially with all the messages set to be downloaded).
The client is slow to sync updates:
If I use a desktop client to mark an email as read, or delete it:
- Other desktop client syncs that in no time.
- IOS phone client takes forever (like it gets stuck).
I did follow the advice found here. It has been days now - if it was ever going to sync all the emails, it would have done so by now.
Latest IOS, latest eM Client mobile version.
So, normal performance in general (thoug it does just close by itself on occasion), but the sync is pretty slow and seems stuck.
I even tried setting the sync interval (in the advanced options) to shorter intervals, and lower - same results.
I’ve also tried enabling and disabling background app refresh. Doesn’t seem to affect things.
- New mail notifications work wonderfully - better than the native IOS client.
- Syncing changes from the server (using webmail or desktop Em Client - or Betterbird) is very poor.
- Other stuff works fine, most of the time (occasional crash/self-close).
My own 4 x IMAP accounts (Gmail, Outlook, Yahoo & iCloud) account folders all sync pretty quick and no issues with more than 100,000 emails using iOS 26.2.1 . Nothing gets stuck.
So could be the account eg “had a connection error with the server” so stopped synching which might explain why it looks / appears stuck.
So press “Menu / Settings” and first look for any “Red errors” next to any of your accounts. If there is errors close and reopen eM Client.
If no red errors next to accounts, then press “Show Operations” and see if it’s still initially synching, as could be there maybe acct folders “still not all initially completed yet” since setting up the app.
Also if you have a Gmail account, initial downloading / synching messages to folders time might also be caused by eg: Gmail throttling as @Michal_Burger advises in his post below.
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