Your node is synching the entire blockchain and validating the consensus rules...
BTG
- NBXplorer headers height: 853458
- The node is synchronized (Height: 853458)
MONA
- NBXplorer headers height: 3396395
- The node is synchronized (Height: 3396395)
GRS
- NBXplorer headers height: 5190019
- The node is synchronized (Height: 5190019)
DASH
- NBXplorer headers height: 1875086
- Node headers height: 1875086
- Validated blocks: 1874916
LTC
- NBXplorer headers height: 2727484
- The node is synchronized (Height: 2727484)
- NBXplorer is synchronizing... (Height: 2537721)
BTC
- NBXplorer headers height: 854131
- The node is synchronized (Height: 854131)
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.