PI AF 2017 SP2 is a service pack that corrects four issues. This service pack includes PI AF Services 2017 SP2 and PI AF Client 2017 SP2. If you elect to install and execute the AF SQL Scripts separately, an updated PI AF 2017 SP2 SQL Script is also provided.
: If you are affected by work item 158118 (described in the release notes), which may cause a performance degradation of PI Vision when used against PI AF, you can restore performance by simply upgrading PI AF Client on the machine where PI WebAPI is installed. It is not necessary to upgrade PI AF Client on every client machine to correct this particular issue.
For details on all the fixes, please consult the release notes.