New SSD Startup external disk. Acting weird and apparently slow.

Hello helpers :)

I am having this issue with this iMac.

I installed an external SSD that I use as startup disk, since the inside HD was failing.

Now I tried to change the desktop background with a dynamic picture (dark at night and light during the day) but it didn't change, it stayed solid gray. I Am able to see that something is happening because the top bar only was changing with the background picture I was selecting (that's the menu bar, jay that little string).

Also seems like every time I reboot it iCloud is not connected and I have to put the password again.

I decided to run EtreCheck (I used it to find out that the internal HD was failing so I decided to give it a try) It says I have a major problem, hard drive too slow. Did it check the internal one that I am not using, or the external SSD? I Zalsohave a Seagate 1TB external drive that I use for Time Machine.

I don't know if the issues are related but seems like this Mac decided to cause me trouble all the way around :(

I will try to attach the EtreCheck report to this message.

Thanks in advance for any help,

G.