You can also run these commands to disable ocsp (and crl) since it can no longer be accomplished in Keychain Access → Preferences:

  defaults write /Library/Preferences/com.apple.security.revocation.plist CRLStyle None
  defaults write /Library/Preferences/com.apple.security.revocation.plist OCSPStyle None
  defaults write com.apple.security.revocation.plist CRLStyle None
  defaults write com.apple.security.revocation.plist OCSPStyle None