Your node is synching the entire blockchain and validating the consensus rules...
BTG
- NBXplorer headers height: 840276
- The node is synchronized (Height: 840276)
MONA
- NBXplorer headers height: 3312297
- The node is synchronized (Height: 3312297)
GRS
- NBXplorer headers height: 5063828
- The node is synchronized (Height: 5063828)
DASH
- NBXplorer headers height: 1875086
- Node headers height: 1875086
- Validated blocks: 1874916
LTC
- NBXplorer headers height: 2674419
- The node is synchronized (Height: 2674419)
- NBXplorer is synchronizing... (Height: 2537721)
BTC
- NBXplorer headers height: 840895
- The node is synchronized (Height: 840895)
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.