Sir it takes lot of time to load;open;show;things
If you're using the app, it appears to slow down with large code / or your device might be underpowered (or need cleanup). Try the website if you can. If you think it's an app problem (and not your internet, device, network etc) - you might want to write the SoloLearn developers, also from the website.
yes it somes take long time. you can contact them by their website
because first solo learns playground sends code to their original complier and then compiler sends output here (fast Internet will help u)