I'd stop using cleaner, it's not needed if you are running windows 10 and can actually cause more bother down the line.
What anti virus software are you using? If again on Windows 10, then Windows defender is all you needed.
The issue you are having is probably caused by a multitude of things.
First is you only have 4gb of ram, Whcih is the absolute minimum supported by Windows 10. This means that once Windows has loaded everything it needs to, you probably have very little of that 4gb left.
Which in turn means that instead of using Ram, Whicj is fast, it's instead using your hard drives page file to store programs in.
If the laptop has a mechanical hard drive, rather than an ssd, then this is going to again have a detrimental effect on performance.
Personally I would invest in some extra ram, so if you can list the actual model I might be able go work out how much ram your computer supports as well as whether it's an easy installation or requires a laptop tear down.