It's not an issue, the server is just telling you that your gump is larger than the default buffer size that is used for compiling gumps - and that it had to create a new temporary buffer to process your gump. The temporary buffer is free'd after the gump is sent though.

The point in this message is to inform shard developers that there may be an issue with a gump, because they are not usually that 'big' in bytes.

There are a few of my own gumps that do this, but tbh, I just removed the line that shows the warning, lol.
 
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