The I/O Page Latch wait type category includes all the waits that are associated with non-I/O page latch bottlenecks, including the following:

• ASYNC_IO_COMPLETION
• IO_COMPLETION
• PAGEIOLATCH_DT 
• PAGEIOLATCH_EX
• PAGEIOLATCH_KP
• PAGEIOLATCH_NL
• PAGEIOLATCH_SH
• PAGEIOLATCH_UP