why internet connection only seems to run 20% of it full speed?

i genuinely asking because idk and i assume this the best place to get answer. for example i got 100mbps internet but when i download something at my ps4 the download speed is only 13 mbps while on internet speed test it said 90 mbps ( i already use the lan cable and no one were using the internet but me)

submitted by /u/Grandhatred
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from /r/Technology https://ift.tt/2R3dhdm