I have the same problem, my computer also uses amd radeon r4 and comes from Dell. tried many methods to get rid of the lag. But none of them worked. All drivers were updated to the newest. But it's just keep lagging. This had driving me crazy. However I found a solution to this. Since this is a driver issue so all we need to do is just get rid of the driver, computers work without graphic card drivers.
- Right click "this PC" icon.
- go to manage
- Click device manager
- Click Display adapters(click the only option under it, AMD Radeon(TM)R4 Graphics)
- Click Driver
- Click disable driver. (Try this on your own risk, I don't know anything about computers, this was just my own experience, if you tried this and it caused problems, please don't blame me, I just wanted to share my solution to this)
After all that was done. Your PC no longer lags. But......this is only atemporality solution. Because when you pay attention to animations of switching apps or closing apps, they look worse than before.
Although your computer no longer lags, but the graphics do have lower qualities.
I hope the AMD website will give me a perfect solution for this, and I also hope this can help you.