This option determines the size of the buffer, in bytes, between core and Gui. Can be useful to increase on low bandwidth connections, or if some results are truncated because they're too big (sources lists of very popular files, searches with many hits,...)
Be careful when setting this option; lower buffer sizes (such as 8192) can prevent Gui from connecting to the core altogether.
Default value for interface_buffer is 1000000 bytes
This option is stored in downloads.ini