In our project we have > 7.000 images without alt tags. The batch functionality is simply great, but the limit of 50 items per batch is much too low.
Increasing the limit to > 75 already leads to Status Code 500 responses from the server on AJAX requests, so setting that is not enough.
You also need to delay the AJAX requests a bit, so that they don't all hit the server at once.
I'm attaching a MR do solve that, while I'm not sure if it should ever be merged. So if you don't like it, it might help others in same situations.
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Limit (and delay?) might be implemented as setting for the submodule eventually.
Works great for me. Even the loading indicator animation works nicely, so maybe it's really not that bad. Of course the value of 500 is totally discussable.