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It is much slower than Chrome - check http://www.leboncoin.fr and try to move the mouse above the map. The lag is very noticeable.

What about "tech preview" and "not optimized" did you not understand?

Can you say the same without it coming off as mean-spirited? One example: "They did mention it was a 'tech preview' and that it was 'not optimized'."

You're right I should have expressed myself differently.