When writing apparently not the fastest

I've tested it for fun with the tool h2testw 1.4 on their speed down. In addition I have, however, maintained my previous data on the card and the tool only write four 1 GB large files and can be read again. The write speed was 5.44 MB / s and read speed 13.6 MB / s. Well, the reading speed is not outstanding, but acceptable for a card of class 6. The read speed should be at least at a class 6 card. 6.00 MB / s. In my test it was slightly lower. And that's slow for such a card.

Conclusion: For me, the card is sufficient at the moment. Other buyers, I would recommend getting perhaps to look at other cards in the price range. It may be that there are faster cards for the same price.