Why does my Nokia 114 lag?

My phone gets hang up... once it's switch off.. it takes lots of time to switch it on.. day before yesterday my mobile was switched off but I am facing the problem to see it on.. when I switch it on it's display screen appears complete white.. please help me to Sort this problem?

Hmm.. Do you have a lot of media files in your phone? Delete some. Your phone may be lagging because it's running short on storage space.

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