Sudden drop in download speed?

Yesterday I noticed that suddenly my internet speed was terrible. It still says the signal strength is "excellent" but i can't even manage to watch a YouTube video at 240p which is really saying something. Also I have noticed with my iPhone connected to the same Wi-Fi I still get great download speeds and no problem watching videos and such. Any help would be great.

Delete temp files of your computer then speed will be increase.
use shortcut window+r then %temp%. All files will be show. Then ctrl+a then delete.

Is your Wi-Fi connection password protected?

If not, someone may be using your connection.

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