Create a bootstrap file to speedup wallet synced

On Windows: Go to CMD command windows, locate to your wallet data folder.

cd C:\Users\%USERNAME%\AppData\Roaming\Litecoin\blocks

Create a bootstrap.dat file using copy command

copy /b blk00001.dat+blk00002.dat+blk00003.dat+blk00004.dat+blk00005.dat bootstrap.dat

On linux, locate to your wallet data path and execute the following command:

ls -1 blk[0-9]*.dat | sort | xargs cat > bootstrap.dat

How to use this file to speed up the wallet synched?

Download and save this file to your wallet data path. Restart the wallet daemon