While Bitcoin core is syncing, you should still be able to do a dumpprivkey in the console window. You can then sweep and import into a lite wallet like electrum.
This is good advice.
I personally don't have any problem yet, with Electrum.
Why there are some people suggest blockchain.info wallet for better to use
![Undecided](https://bitcointalk.org/Smileys/default/undecided.gif)
bc.i wallet is long time ago has been removed from bitcoin.org wallet list, for web wallet i suggest to use BitGo and don't store big amount on that.