Why does the text jump in the browser?

Question

Computer networks

Good afternoon! On some sites, the text (letters) jumps.
Page: www.slideshare.net/jvetrau/design-weekend-2014
Windows 7.
Yandex Browser (14.4.1750.13414 (22153cc)).

Answer 1

This problem may be in the fonts. Use other fonts with Cyrillic support.

Answer 2

What does jump mean?
GIF inserted instead of text, css animation, poor layout...

Answer 3

Play around with a small amount of font size. This happens in some borderline cases.