Have you tried rebooting computer &/or restarting LW?

Have uploads also slowed down?

Do you show as firewalled (tools > advanced tools)?

What's your connection status (weak, medium, full, turbo)?

Do you only see slow speeds at certain times of day?

Try changing ports: In LW tools > options > advanced > listening ports. Change listening port to 65000, or something in the range of 49152 - 65535 > ok.

If you have port forwarding set up, you'll need to change the 'manual port forward' number > ok & then also change the forwarded port number within your router config.

And don't forget to also change the port allowed through your software firewall.