If you use NTFS for your Linux partition instead of something like EXT4, Linux will be slower than it would normally be. I use an EXT4 partition for Linux that holds the OS and programs, an NTFS partition for Windows that holds the OS and programs and a separate harddrive formatted for NTFS for my files and steam games. That allows me to share files between operating systems. It also means that reinstalling an operating system or installing a new one is less of a big deal. I still have to copy settings to my personal files drive if I want to keep them when I reinstall, but it's better than having to copy every file of mine every time.
Yeah, I read that Ext4 files aren't quite compatible with NTFS or any other file format. But I've already installed it, I just did it with the default config (no custom partitions or anything like that). Thanks to all of you who helped me out with this.