Hi man, I dumped private keys (there are 700+ not to include reserved addresses). So, regarding your question, - I've got transactions on multiple addresses.
I imported my keys to Electrum, but it's synchronizing already 24 hours. Is it ok?
There's no reason to abandon Bitcoin Core and use Electrum for this. It's no surprise for Electrum to take a long time synchronizing 90,000 (or more) transactions, if you really want to use Electrum, don't import all private keys at once.
If you answer my previous questions I can continue with more suggestions
