Execution stalls may signify that a machine is running at full capacity, with no computation resources wasted. Sometimes, however, long-latency operations can serialize while waiting for critical computation resources. This metric is the ratio of cycles with no micro-operations executed to all cycles.
The percentage of cycles with no micro-operations executed is high. Look for long-latency operations at code regions with high execution stalls and try to use alternative methods or lower latency operations. For example, consider replacing 'div' operations with right-shifts, or try to reduce the latency of memory accesses.