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.