I just discovered that if you click on one of your subratings in the table of ratings by speed/size on your profile, the the graph shows your timeline for that speed/size subset!
Well I’ll be danged!
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Did you also know you can select a certain time period from the lower graph and the main one will zoom to that section?
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Yes, that was more obvious because things change when you mouse over.
I only discovered the subtype graph thing by looking at the code 
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