Your mileage may vary depending on your ISP and/or VPN. When I was working in Shanghai last year, my home internet was pretty bad for oversea websites while my office internet worked fine for the most part. Access to oversea servers will most likely suffer during peak hours and holiday periods where traffic becomes high. @rice_crust seems to have a decent experience with his ISP, so perhaps consult him for some advice about that.
If you desperately want to access blocked sites from China, you should consider using a paid VPN since most free VPNs are already blocked. Beware that China continues to block VPNs whenever they feel like it, so unless it's a corporate VPN you might get locked out suddenly without notice.
Also note that China has a tendency to block Google at times for reasons unknown. Google and Gmail were blocked for an extended period from 2011 to 2012. Access appears to have been restored, but ongoing access is not guaranteed. Twitch was unblocked some time last year, so have fun with that. Twitter and Facebook, however, remain blocked.
Lastly, watch your internet mouth. A colleague and I both had cops come knock on our doors out of the blues and gave us a talk about some stuff we posted on the internet regarding China. Nothing bad happened but the experience was pretty damn surreal. They basically told us that, while they know people hop the Wall all of the time, they don't really mind as long as it's not critical of how the country handles certain sensitive issues. Really weird, but it happened. My name is probably on a list somewhere, now.
Have fun during your stay in Shanghai, though! The climate isn't great during the summer and winter, and you'll get your fair share of mosquito bites for sure, but it's an interesting place to live. Go get yourself some Shanghai-style dumplings and traditional confections. The Bund is beautiful at night, so sit by the river and have a few drinks at all of those bars. Have fun singing lots of karaoke and, if you're a duder, visit some hostess clubs. Just don't do take-out unless someone else is paying. ;P
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