What is your operating system?
Linux Ubuntu 18.04
What is your Shotcut version (see Help > About Shotcut)? Is it 32-bit?
Can you repeat the problem? If so, what are the steps?
(Please be specific and use the names as seen in Shotcut, preferably English. Include a screenshot or screen recording if you can. Also, you can attach logs from either View > Application Log or right-click a job and choose View Log.)
Previously I used 20.10.31 Shotcut. After installing 21.03.21 shotcut regularly hands/freezes for 1-2 seconds. Sometimes it’s not repeatable but for example it always freezes when stwiching between keyframes and timelines (I have them on two different tabs in the same window). It looks like that new shotcut requires much more processor/graphic power. But why? If I look on CPU history processor is never used up to 100%, max. to around 50%.