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

GRS

• NBXplorer headers height: 5564891
• The node is synchronized (Height: 5564891)

LTC

• NBXplorer headers height: 2886522
• The node is synchronized (Height: 2886522)
• NBXplorer is synchronizing... (Height: 2537721)

BTC

• NBXplorer headers height: 894084
• The node is synchronized (Height: 894084)

BTG

• NBXplorer headers height: 892531
• The node is synchronized (Height: 892531)

MONA

• NBXplorer headers height: 3645964
• The node is synchronized (Height: 3645964)

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.