CRS 317-1G CPU Usage

Good evening;
We have a router model CRS 317 which our severs connected to it.
These configurations are done for this router as bellow:
2 ports are bridge and IP address set for it and server connected to the port 1 of the router directly. But we have a problem that is decreasing of bandwidth and increasing of CPU load however we have 1000 Mbps bandwidth on the router. Is there any solution for this problem?
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