Platform is distressingly slow!

Suddenly, starting from yesterday, the platform became very slow that it takes 5 minutes to save any change and does not load pages with the customized styles. Eventually, I am not able to access it at all today, neither can I access the database! I did not upgrade my builder yet, has this anything to do with the upgrade issue? I locate in Malaysia and my internet connection is utterly fast. The platform used to be within accepted speed. However, last two days, the speed sharply degraded.
Many thanks for your help!
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