Game lags on each dialog/movie/new event

The latest patch introduced many lags to the game.
For instance, I’m playing the The Infinite Cycle mission: each time I enter the next room the game freeze. Each time the new unit (type of the unit) appears on the screen the game freeze. I cast new spell - freeze. The movies are lagging constantly. Each 5-10 second I can expect a lag for 0.5 a second.

It seems like the lag happens when the game tries to load new data.
But, I’m playing the same PC, the same Windows OS (haven’t updated it recently), the same set of programs installed, except for the Starcraft 2 itself, it has been updated recently (13 July ?) and after that update the lags have began.

Please, assist in this problem.

Thanks,
Dima

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It seems to freeze when someone is talking and i get an ingame cutscene.

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