The internet connection might get slow due to the client consuming all available bandwidth for either downloads or uploads.
The client is set to use all available bandwidth by default. In most cases this doesn’t cause a problem, since most files or file changes are transferred rather fast than slow. However it might happen that transferring large files or changes on large files are taking very long and therefore block internet bandwidth for some time.
The client offers a set bandwidth limits for up- and download as well as some pre-defined profiles which doesn’t make it necessary to configure some values.
Please read our documentation about configuring bandwidth limits.