Playback problems with heavy score

I recently installed the version 3.0.5 of musescore, and wanted to edit a symphony on which I am working. But as soon as I clicked on the "play" button, the program reads some measures after where I clicked, and stayed on a specitif note. I've made a video to show you what happens :

https://www.youtube.com/watch?v=Y2X9qyCfvLI&feature=youtu.be

My specs :
Windows 10, intel i5 7500, 8 Go of DDR5 RAM.

If you need more infos, I'll be glad to give them. ;-)