SMLG provides average response times of the overall system.
ST03N provides response times.
System Maintenance Jobs

Table Maintenance
To copy tables across clients, invoke RSCLTCOP
To make table adjustments across clients, RSAVGL00
To invoke the Substitution/Validation utility, invoke RGUGBR00
To transport SAPscript files across systems, RSTXSCRP
To release batch-input sessions automaticlly. RSBDCSUB
R/3 Tablespaces
