Too much NextGEN Gallery ?

Hi,

a couple of years ago I start to migrate my old NextGEN Gallery with the old Foo gallery plugin (https://fooplugins.com/documentation/foogallery/getting-started-foogallery/nextgen-importer-tool/ if I understand) and it works OK but it was too much work to migrate more than 3400 galleries and modify thousands posts so I stopped after a few galleries.

Today I try again with the FooGallery Migrate plugin and now the “Migrate!” page never loads.

I suppose it’s because there’s too much galleries (3385!) ? Could you please help me ? Thanks a lot.