Multiple download of the same JAR file

We have a collection of applets packaged in a single JAR file. Some users (web developers that use our applets) have been complaining that the applet is extremely slow to start up.
When the html page includes more than one applet from the same JAR file then, "ONLY IN SOME CASES", the JAR file is downloaded multiple times.
By capturing network traffic we can also think that the JAR file is downloaded even when accessing an image packaged in the applet's own JAR file.
One further detail: this "DOES NOT OCCUR" when there is a fast connection to the server (or at leat it seems so). In these cases, the JAR file is downloaded once. It looks as if the problem only occurs on slower network connections.
Thanks in advance for any help.

Mmm... I don't think this is the solution... all the applets share a lot of classes (the big part of the JAR files).
But my question is....: why in some cases the JAR is downloaded more than once???

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