my huge file size is causing blender to freeze every few seconds this is not normal and its a fairly simple low poly scene as well with no textures and materials yet. i have multi res for some sculpts but even when its off it lags like crazy. i have done far more complicated projects that took up a fraction of the file space. i have compress files enabled by default, looked through the outliner and see nothing unusual, even tried appending everything into a new file and it was still the same. please help because working on it is almost impossible and i need to finish it for my assignment.

https://1drv.ms/u/s!AlP6LHpiuaPjgR1yBwVETzMm23nc
The scene takes up almost 2 GB RAM, if you are indeed using an old laptop, this might be the bottleneck, especially if you have a web browser open with a few tabs, too.
In windows you should always have an eye on the task manager, especially the performance tab.

As Anders, I would not call this low poly aswell, with almost 50k polygons. That is why rob suggested to delete the heads, as they are making up the majority of those. You could however dissolve a lot of edges, too...