@tranthanhxhong: Right, that's normal. The exact amount will depend on the size and complexity of your PDFs. (Only up to five tabs are currently kept in memory at a given time.)
If you see a much larger number in Troubleshooting Mode, or a number that continues to increase without ever going down, we'd want to know about that, but what you're showing isn't any indication of a problem.
If you're getting much larger numbers with plugins enabled, you should identify the plugin responsible and report it to the plugin developer (and also let us know).
Hi, I'm still getting this problem on a 2019 MBP using Zotero 7.0.21. Zotero's memory usage will inflate to the point where I get the Apple dialogue telling me I've run out of memory. I'm not using any plugins.
Upgrade Storage
https://s3.amazonaws.com/zotero.org/images/forums/u9082669/t0l69lqa0sttylcr6u7b.jpg
https://s3.amazonaws.com/zotero.org/images/forums/u9082669/viot47nevdk56i8bq7g2.jpg
If you see a much larger number in Troubleshooting Mode, or a number that continues to increase without ever going down, we'd want to know about that, but what you're showing isn't any indication of a problem.
If you're getting much larger numbers with plugins enabled, you should identify the plugin responsible and report it to the plugin developer (and also let us know).
Are there any fixes?
https://forums.zotero.org/discussion/comment/494156/#Comment_494156
https://forums.zotero.org/discussion/comment/495788/#Comment_495788