Hi, Wellson - The WiFi speed is always lower than hardwired. Did you try to check your speed via the direct connection from the modem to your PC? Please refer to the article from XFINITY Knowledge Base about how to improve your WiFi speed: http://forums.xfinity.com/t5/Internet/ANSWERED-How-to-improve-your-Xfinity-Wifi/ta-p/2940646
Also, please do not send private messages to moderators without a request. Sending unsolicited private messages to moderators or any other user is a direct violation of our forum guidelines. Per those guidelines, and continued violations you could be subject to a revocation of your Xfinity Forum privileges. We never want to get to that point with any user so we recommend reviewing those guidelines thoroughly.
Please let me know if you have any questions.
@Wellson - Please send me a private message with your full name, the account holder's name as it listed on the billing statement, a phone or an account number. I will check if there are any issues with your RF signal levels. Thank you!