Perhaps you should try some spelling variations:
performance programming » performance programme (Expand search), performance program (Expand search), performance programs (Expand search)
methods performance » method performance (Expand search), metrics performance (Expand search), meta performance (Expand search)
decrease processes » disease processes (Expand search), defense processes (Expand search), decay processes (Expand search)
decrease decrease » decrease release (Expand search), disease decreases (Expand search), decrease sucrose (Expand search)
decrease and » decreases and (Expand search), decrease in (Expand search), decrease of (Expand search)
and decrease » and decreases (Expand search), and decreased (Expand search), and increase (Expand search)

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( decrease AND decrease decrease processes ) OR ( python AND methods performance programming ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease and decrease decrease processes ) OR ( python AND methods performance programming ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease and decrease decrease processes ) OR ( python AND methods performance programming ))*.