Используйте приложение APKPure
Историческую версию Phone Faster можно получить на Android
Много способов сделать свой Android телефон работать быстрее (без укоренения)
Talking about the solutions, there are many possible reason behind a slow device. It could be a buggy App or an unupdated Android device. Today we’ll discuss all different possibilities to look over. You would surely find a solution for your slow device from any one of this methods.