2 Problems regarding Streaming/Mirroring and slow Internet

I am trying to stream my Gear VR experience using a paid app called Screen Stream Mirroring. I can get it to stream with no problem however, any streaming I do results in a video fee that is EXTREMELY laggy, unwatchable. I'm connected to my home network, which I have zero issues with when streaming 1080 from my PC. I downloaded a seperate app to locally record what's on the screen, as soon as I start playing a game, it records it fine but as I go to watch my game through a video player app, the video is choppy. Maybe 1 frame for every 3 seconds. Same as when I stream for others to watch. Same thing happened when I connected my chromecast. My TV shows a mirror of my phone but it is horrendously laggy. I've had some serious issues with this phone since day 1.
Any idea what could be causing it? I've seen other users stream and mirror with no issues, why am I unable to do it? I can't record, I can't stream, and I can't even mirror to my tv because it all lags horrendously.
I'm using a Note 5. It's not running stock I'm using a custom OS and firmware courtesy to XDA.

I am currently using TEKXodus rom and SkyHigh kerner.

Last issue I have, and this is something I have had since day 1, is when ever I try to watch videos on youtube or download files, it's significantly slower compare to my Note 3. I can not watch 1080 videos or 720. Even at 640 my videos sometimes lags! I don't understand why, I have unlimited internet. I called Tmobil but they said that everything is working fine. Anyone has any ideas? I really dislike the Note 5 ;/ I miss my Note 3

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