Why would you want to do this, what are you trying to achieve and are these addresses yours?
I wouldn't want to suggest using something like electrum for that as it'll clog their servers and if you acutally need the data, just leave core running. The chain sync gets slower the closer it gets to the end too so you may as well just hold off until it does as long as it was still making progress (the number was going down on the blocks remaining tally).
When you mean with "yours" that I generated them myself, and didn't stole or obtained them illegally, then yes, I "own" them and they are "mine".
Importing more than a few tens of thousands of addresses into a regular Bitcoin Core Qt wallet is going to make that wallet slow to a crawl.
I tried.
The desktop wallet is not designed to be used with that many addresses, you'll need to find another solution.
I noticed this as well.
Maybe I figure out roughly where the bottlenecking starts and split the adresses onto enough wallets to stay below the bottlenecking threshold :/