Your node is synching the entire blockchain and validating the consensus rules...
GRS
- NBXplorer headers height: 5532203
- The node is synchronized (Height: 5532203)
LTC
- NBXplorer headers height: 2872773
- The node is synchronized (Height: 2872773)
- NBXplorer is synchronizing... (Height: 2537721)
BTC
- NBXplorer headers height: 890613
- The node is synchronized (Height: 890613)
BTG
- NBXplorer headers height: 889119
- The node is synchronized (Height: 889119)
MONA
- NBXplorer headers height: 3624158
- The node is synchronized (Height: 3624158)
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.