How to repair slow SD card downloads on Steamos

Summary
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Slow game downloads in Steamos? This is not your SD card.
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Be ready to lose data. Go to Desktop mode to manually format an SD card in KDE Partition Manager.
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Successfully reform your SD card for quick download speeds on Steam Deck or Steamos.
If you have a steam game or if you have installed Steamos on another pocket brand like the Lenovo Legion Go or Asus Rog Ally, you may have encountered a problem where game downloads on your SD card may be painfully slow. Like the slow pre-brief. So what gives?
Although I cannot tell you exactly why it happens, it seems that you and I are not the only ones to have this problem. Fortunately, a fix has been hiding on various forums for years now, and I think it's time to highlight it.
This is not your SD card
When I see this kind of slow SD writing performance, my first suspicion is that the card itself is out. This is exactly how one of my SD cards began to behave on my ally Asus Rog just before the console completely makes the card. Thank you Asus, by the way.
1:29
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But in this case, I literally came to wipe my Lenovo Legion Go and replaced Windows by Steamos. The SD card normally operated a few minutes before, but after Steam had reformed it on Steamos, the downloads became so slow that they were fundamentally unusable. Similarly, transfers from the internal SSD to the SD card should be rapid, greater than 100 MB / s, but instead, it is kilo-kilo-great per second and short gusts of reasonable speeds.
Obviously, something went wrong when Steam has formatted my SD card, and that's the key when it comes to solving the problem.

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Why do SD cards decrease when they are so great?
Small device, large storage capacity.
Be ready to lose your data (it's worth it)
Before going ahead, you should be absolutely clear that we will erase all the data that is currently on your SD card. As long as you allowed Steam to synchronize with the cloud, your backup data should be good, but your games and everything else on this SD card will be toast.
However, if the reformat works, you should be able to download these games much faster than before.

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Go to Desktop mode
In order to manually format the SD card to solve performance problems, we will have to go to office mode. It's quite easy. Just use the menu> Power supply> Go to the desktop.
This will bring you to the KDE Standard office experience for Steamos.
If you don't have a mouse connected to your device, you can use the right analog stick to move the mouse pointer. The right trigger performs a left click and the left trigger makes a right click. You will need the two for what comes next.
OPEN KDE PARTITION Manager
Using your touch screen or emulated mouse controls, activate the launcher button at the bottom left of the screen and access the system of system> KDE.
This will launch the partition manager, this is how we will reformat the card.
Carefully reform the SD card
In KDR Partition Manager, you will see several devices listed in the left shutter. Assuming that your device has only one SD card location, then “MMCBLK0” should be the SD card. Click on it and you will see details about it in the right shutter. Check that the brought size corresponds to what you expect.
The operation of the partition manager allows us to configure a sequence of actions without changing anything on the actual card until we click on “apply”.
Right -click on the SD card partition in the right pane, then select “Unmold” from the context menu.
After that, right -click on the score again and select “Delete”.
Now right -click on the deleted space where the partition was, and choose “new” from the context menu.
In the dialog box that appears, open the “File system” drop -down menu and select “Ext4”.
Once it is done, click on “OK”, then select “Apply” at the top left of the partition manager window.
You will see a contextual confirmation window asking if you really want to apply the waiting operations. Click on “Applying operations pending”. Once the operation is completed, you will see this contextual window indicating that a new disc has been inserted. Click on “Go up and open”.
Now you can get out of everything and go back to the office. Here, double-click the “Return to game mode” icon on the desk.
Go back to steam and format again
Once back in game mode, go back to the storage page via the menu> Settings> Storage, then select the SD card. You will see an prompt to format the card again. Just press “Y” on your controller and wait until the format ends after confirming that you want to go ahead. This can take some time depending on the size of your SD card.
If the process was a success, you will see a gold star appear next to the entrance to the SD card on the storage page.

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Now try to install a game on the SD card, and if everything went well, you should see it hit the maximum speed of your connection or the lowest SD card speed.
I cannot guarantee that this will help you improve your downloads, but it worked on each SD card I tried. Steam formatting of the card causes poor performance, a manual reformat repairs it. I don't know why, but it worked for me. Hopefully, at some point, Valve will repair it so that Steam can do it right from the start, but we hope that your own SD card is now fast.