Your node is synching the entire blockchain and validating the consensus rules...

GRS

• NBXplorer headers height: 5599963
• The node is synchronized (Height: 5599963)

LTC

• NBXplorer headers height: 2901230
• The node is synchronized (Height: 2901230)
• NBXplorer is synchronizing... (Height: 2537721)

BTC

• NBXplorer headers height: 0
• The node is starting...

BTG

• NBXplorer headers height: 896168
• The node is synchronized (Height: 896168)

MONA

• NBXplorer headers height: 3669345
• The node is synchronized (Height: 3669345)

DASH

• NBXplorer headers height: 1874916
• Node headers height: 1874916
• Validated blocks: 1874916

Watch this video to understand the importance of blockchain synchronization.

If you really don't want to synch and you are familiar with the command line, check FastSync.