The only way to reduce the load on your computer due to shared folder is by giving access to sepecific and required people. Well this can be a situation but sometimes you need to share some files publicly with many people. In Windows Vista and Windows 7 there is a way to fix this.
When you share a folder select the advanced mode and you will see something which is pretty new. There is a number drop down which allows you to limit the number of simultaneous users on a folder. This solves the issue if you had been complaining about slow computer everytime you share something.
- Right click on any Folders > Properties > Sharing > Advance Sharing
- Next Window you will see option to enable sharing and you can give a Share Name of your choice which can be different from the folder you have.
- Next you can choose number of users who can simultaneously access this folder.
- You can also configure the permission which you should do so nobody is able to change the content of your folder.