Same situation here. Downloading attachments takes so much time on different computers (desktop, laptop). Driving me crazy.
Agree that this issue is specific to eMClient and had it again today.
Never had this issue with Thunderbird.
miércoles 31 mayo 2023 :: 1345hrs (UTC +0100)
I agree that there is an issue that needs to be resolved though believe that will be easier said than done as having run similar tests, I do not experience the performance difference with eMC, however, accept that others do; this is why I believe any issue will be difficult to resolve.
In all instances my attachment of 5mb was there almost instantly.
I used Surfshark VPN with antivirus to slow things down.
skybat
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I am also getting this issue. 1.1MB PDF attachment taking 7 minutes to download over a 75MB connection.
Downloading the same file via GMail is instant.
Also, if you stop a download and restart it, you can never open the file as you get a “corrupted” error.
100% an eMClient problem.
Please see my recent comment here. Even if it is not a Yahoo! account, the setting may help.
Other reports of the same issue, dating back quite a long time:-
Why are attachments so damn slow to download compared to Gmail? - Mail - eM Client
Download attachments is very slow - Mail - eM Client
Slow attachment downloads since 9.2 update - eM Client
Downloading attachments is extremely slow - Mail - eM Client
Downloading attachment (pdf) very slow, ends up with corrupt file - Mail - eM Client
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I have the same experience too with EM client. As well on a win 10 laptop with high speed internet as on my android telephone…
Pinging on this one…as I am another user with painfully slow attachments. I have been getting some mid-sized PDFs lately from a vendor (between 10-20MB in size), and they are awful to sit and wait while they download. If I use Outlook, they download and open immediately. PC, Pro User, on Windows 11 latest version.
Same situation here. Downloading attachments are very slow 
In addtion to gizmo2501’s list, here are some other threads on the same topic:
Slow to download attachments - Mail - eM Client
Very Slow Download of Video Attachments - Mail - eM Client
Yahoo mail downloading attachments: super slow - Mail - eM Client
You have to read through these threads to find solutions
In a July 2023 post in one of these threads, Gary recommended adding a string parameter to the advanced options box.
He said this downloads attachments in a way that is faster but less reliable, and so it should only be used if you were having a problem.
In a September 2023 post, he pointed out the checkboxes for downloading attachments in Accounts > IMAP > Sync Options.
My understanding is that this basically pre-downloads all the attachments you get locally. (It would be great if those messages and their attachments go back to the server when you move them out of the inbox, but IDK.)
So, those are the two fixes on offer now in one post. I tested both of them and they worked.
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EDITED: the string worked perfect for me.
Initially it didn’t, but upon a check id misspelt it.
Thanks gary
Did you apply the setting I gave above?
I have tried the setting and also have made the changes to the account settings; attachment download speed is still very slow. We are using the default Windows antivirus, have a gigabit connection and no VPN.
We have to go to the gmail web page and download attachments from there. They come very fast.
Any solution on the horizon? This is ridiculous. The software looks very promising, but there’s no way I’m paying two cents for it with this issue on board. An absolute dealbreaker. This topic dates back to a YEAR ago and the problem apparently persists.
Did you apply the setting I gave above?
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I changed an account to Gmail and it’s working so far. So I’m not sure about the solution.
Gary’s advice in his Jul '23 post worked brilliantly.
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This morning I let a 16MB photo download for 2 minutes before giving up and going to web Gmail instead.
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I then followed Gary’s advice and added that Advanced Parameters text. Downloading is now almost instant.
That raw download option @Gary advised is now also available to enable in V10 Beta for Desktop and Mobile app “without adding a parameter string” as in the Gmail IMAP example below.
Does this solution apply to exchange / 365 accounts as well? Is a different string needed?
No, the setting is for IMAP only.
For Exchange it may be a slow connection to the server, or just a slow server. There is something you can try though. It won’t speed up the connection or server, but it will cache attachments when they arrive so when you later click on them, they should open immediately. Go to Menu > Accounts and click on the Exchange tab for the account. Scroll down to Sync Options, tick both of them, and click on Save & Close.
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