Hang up 
Author: Sergey P.
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my program hang up or waiting so long when I try to see preview. there is many files in project directory. may be I need to delete a lot of them?
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Author
it's about one project, others work properly
Author
please answer my question. I delete dir preview in project dir, program remake it once more. but preview open very slowly. what i can do more?
Hello Sergey,
Did you add some custom code to the project? Have you added big images to it?
Many thanks!
Author
Thanks for good idea, Claudio. I optimised all photos, but it has not helped. Then I have deleted yandex metrika code and all became good. May be this code have mistake or program wait while download image of metrika from yandex site.