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Try making your map a "Parkour" map You have the option of *space-Parkour* and *Normal Parkour* So don't worry about it, Just change your Map settings--> Click..

Create  -> Without Formate -> Scroll down and Click Parkour

Now you can jump at any hight as long as it is not a Suspicious Jump hack, Near the top of the map  Or above the highest point, Then you will Self destruct.

Good Luck

Try Refreshing the game or disconnecting your wifi. And re connecting it. as you can see in the Bottom Right Your FPS is RED and Ping should move to an 999+ if you move < so Try getting a better internet connection. As "Anonymous" said *Above* This happens due to a slow internet connection. Sometimes it may also be an issue with your browser, so for better gaming experience please run the game on Standalone Flash Player.

Try getting a better computer or Wifi Connection, New Computers can load faster games doesnt matter about your wifi.