Too slow animation of Google Mail Checker icon

[alexantr]

Normal speed on Chrome (and Opera): [url=http://yashkin.by/vivaldi/google_mail_checker_chrome.mp4]google_mail_checker_chrome.mp4[/url] (225KiB) Slow animation on Vivaldi: [url=http://yashkin.by/vivaldi/google_mail_checker_vivaldi.mp4]google_mail_checker_vivaldi.mp4[/url] (270 KiB) Feel the Difference. I think any extensions with animated icon will have same problem.