Hi all. Just picked up a base tbMBP 13 and connected it to the 27ud88 LG 4K monitor. Everything is good except when playing multiple YouTube videos or when using Parallels. If I have more than 1-2 tabs playing high-res YouTube videos or when I have Parallels (Windows 10) open, the computer noticeably lags and stutters from time to time. I know this computer can run two 4K monitors so I think I may be doing something wrong. Any advice? Thanks in advance!