What' s more, it was too slow.

更重要的是，它的速度非常慢。

youdao

At that time, PCs were very expensive and it was too dear to link one ' s computer to the web. What' s more, it was too slow. So few people knew what the Internet really meant.

在那个时代，不光电脑贵，电脑连接网络的费用更是可怕，更严重的是网速还超慢，所以很少有人知道网络到底意味着什么。

youdao

It's too fusty, too slow, too intimidating to newcomers and far too self-serious.

WSJ: Don't Make Golf Too Easy | Golf Journal by John Paul Newport

With the U.S. housing market in a slow revival, it may be too early to say what the skyrocketing insurance rates could do.

NPR: Coastal Homeowners Stagger Under Insurance Costs

Initially, at least, this "man-made" biodiversity will be far too small and slow to compensate for man-made extinctions, but it's worth noting the possibility.

WSJ: Matt Ridley on the Possible Formation of a Species | Mind & Matter