If you saw heaps of incoming connections (more than usual), you were probably connected as an ultrapeer. Ultrapeers handle more network traffic than leaves & shield leaves (people with slower connections, firewalls etc) from unnecessary traffic. LW decides who connects as an ultrapeer...if the network needs ultrapeers & you have a fast connection & aren't firewalled then you'll automatically connect as an ultrapeer.
GnuFU en - Gnufu

It's nothing to worry about & shouldn't result in slow download speeds. Who is your ISP...some ISPs will shape p2p bandwidth at certain times of day, or if you're deemed to be a 'heavy user'.

You can disable ultrapeer capabilities if you want to. In LW tools > options > advanced > performance, tick the box to disable ultrapeer capabilities > apply > ok.
Or, if you're using an older version of LW tools > options > speed & you'll see the option to disable there.