Hello, i have this ROM since a long time and the Google Play Store does not work now. It always gives the error something-15 when i try to download or update apps. Also the Google Talk error always shows up, do i need to update my ROM or i can get it working with this one? Because i dont want to update if im going to lose speed.
I don't have the Google Play store installed on my device, so I can't comment whether it's a universal problem or not. However, I can suggest that you try uninstalling the latest Play store update and seeing if that helps. Even more extreme, do a factory reset, and immediately disable automatic updates in the Play store.
As an alternative if you just can't get Play store to work: you could install the F-Droid App Store (open source Android app repository) and/or the Amazon appstore (you can find old versions on the net). However, with a device like this, with so little storage and RAM, you're really best off having only the absolute essential apps installed, so the best thing is to sideload only the specific apps you need and avoid the Play store and any other app stores entirely.