It's totally dependant on getting good proxy connections that allow anonymous connectivity. These are getting rarer, but are still possible to find. If you can locate one that works one day you might find it doesn't work the next. Depending on where your proxy is and it's bandwidth the latency it produces can be anything from low milliseconds to several seconds delay.
The biggest dealy is in locating working unsecured proxies which is the most frustrating part of the whole exercise.
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