Your node is synching the entire blockchain and validating the consensus rules...
GRS
- NBXplorer headers height: 5310167
- The node is synchronized (Height: 5310167)
LTC
- NBXplorer headers height: 2778284
- The node is synchronized (Height: 2778284)
- NBXplorer is synchronizing... (Height: 2537721)
BTC
- NBXplorer headers height: 866890
- The node is synchronized (Height: 866890)
BTG
- NBXplorer headers height: 866018
- The node is synchronized (Height: 866018)
MONA
- NBXplorer headers height: 3476182
- The node is synchronized (Height: 3476182)
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.