Exporting large number of data records is slow

[zhoumingcheng]

Describe the bug
When the amount of data is large, exporting data will be very slow.
Here, it's not a failure caused by exporting data timeout. When I uploaded a text annotation data of 50,000 records, with a file size of approximately 30 megabytes, and tried to export it, it took nearly 4 minutes.

To Reproduce
Steps to reproduce the behavior:

Expected behavior

Screenshots

Environment (please complete the following information):

• OS: [e.g. iOS]
• Label Studio Version [e.g. 1.12.0]

Additional context
Add any other context about the problem here.

[sajarin]

hey @zhoumingcheng

Thanks for the bug report, are you able to reproduce on the latest version? Furthermore, are you deploying your LS instance locally or is it hosted on a service? Wondering what the bottleneck is on this export process. What are your impressions?