Your node is synching the entire blockchain and validating the consensus rules...
BTG
- NBXplorer headers height: 843858
- The node is synchronized (Height: 843858)
MONA
- NBXplorer headers height: 3335235
- The node is synchronized (Height: 3335235)
GRS
- NBXplorer headers height: 5098224
- The node is synchronized (Height: 5098224)
DASH
- NBXplorer headers height: 1875086
- Node headers height: 1875086
- Validated blocks: 1874916
LTC
- NBXplorer headers height: 2688885
- The node is synchronized (Height: 2688885)
- NBXplorer is synchronizing... (Height: 2537721)
BTC
- NBXplorer headers height: 844395
- The node is synchronized (Height: 844395)
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.