The Read Quality percentage number is a measure of how much of the information requested by the user is already stored in the shared memory buffer. At system startup, database and shared memory buffer access statistics are refreshed and begin to again compile. Therefore, care must be taken such that this number is not interpeted too close to system start time where the lack of activity will not show an accurate representation. Database performance is maximal the closer this number approaches 100 percent.
If the cached read percentage is below 95 percent, you might be able to improve performance by lowering the values of LRU_MAX_DIRTY and LRU_MIN_DIRTY to increase the number of free and/or unmodified buffers that are available in shared memory LRU queues. LRU_MIN_DIRTY and LRU_MAX_DIRTY can be changed in the onconfig* parameter file located in $INFORMIXDIR/etc.
Hierarchy 
SAP_BASIS (Software Component) SAP Basis Component
BC-DB-INF (Application Component) Informix
STUI (Package) Informix Database Monitor
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