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Close, close, and close.

It's not normally caching on speedtest, which uses 3 different techniques to combat caching. Any web browser/proxy/cache that's still caching it is seriously broken.

Kaspersky also doesn't cache, technically it's buffering and processing delay.

Yes, they have "fixed" it somewhat. The effect is still there and while the test makes efforts to mask it, it does still have an effect though a little in the other direction now. It doesn't give you stupidly high speeds (e.g. 200mbps on a 20mb line) but it still isn't accurate either.