This article is for all the Mac users having problems with Wi-Fi connection after the installing the recently released OS X 10.9.2 updates. The common symptom is that the system takes lot of time in reconnecting to WiFi while recovering from sleep or idle mode. Listed below are the instructions for resolving this issue.
Step 1: Launch System Preferences using the menu selection or Spotlight search.
Step 2: Click Network option under System Preferences.
Step 3: Click on the Settings icon available at the bottom of Network Screen. Select Set Service Order from the drop down list.
Step 4: Drag Wi-Fi in the Service Order list and move it top of the list. Then click OK to confirm the changes.
Step 5: The click Apply button in Network screen to reflect the changes done to Service Order.
Also See: Recover Wi-Fi password on Mac OS X