What I really like about this is that it gives one performance grade based on speed.
With other tools, they break down the grading in a way that a really fast site might have F's in 3 out of 5 categories, while a slower site might have A's and B's across the board. That sort of thing becomes an issue when clients start asking why there are F's.
Your system seems like a much better representation of what's going on with a site. Great work!
Invoice generator
Invoice generator
Invoice generator
Invoice generator
Invoice generator
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Invoice generator