I recently reinstalled electrum on my pc. I then typed in my seed phrase. After doing that, it took a while to synchronize before it showed my transaction history. I do not have any btc in electrum at the moment or for a while already as I moved the coins to nano ledger a while back. The next time I opened electrum, it seem to synchronize yet again but it was quick. This is normal if you haven't accessed the wallet in a while? I did download the updated electrum from the site.
If it's the first time you've installed Electrum, it will have to download newer parts of "
blockchain_headers" first before it can synchronize.
That's currently 56.8MB but I don't know how much data left to download after the checkpoint, but even so, it could take a while for some ISPs.
Then the next time you opened it, it doesn't have to redownload the block headers aside from the latest few (
only a few kB).