Recently active topics in SlideShare tagged with degradation and big presentations

I've tryed slideshare. But after upload the ppt, some slides appears like without focus.
Next, i upload same ppt, but with only first 15 slides. In this case, all is ok.

Look:

First try: for example slide 4

http://www.slideshare.net/tpcjoin/dem...

Second try: same ppt, with only 15 slide, see the same slide 4:

http://www.slideshare.net/tpcjoin/cop...

Perhaps, slideshare make a degrade on big presentation?

Any ideas?