i tried messing with the graphics settings but no help, on the lowest resolution i get 120 fps, but when i move my vehicle it drops into 20 - 30 fps.
I get low fps only 20-30, and sometimes i get sudden fps drop into 12 fps. This morning Apple announced the release of the 2015 refresh of their 15 Retina MacBook Pro lineup. Low FPS in Macbook Pro Retina 15 inch mid 2015. This will also prevent another problem where some external monitors get stuck in mirroring mode on newer versions of macOS. Apple Announces 2015 15 Retina MacBook Pro, Cheaper 27 Retina iMac. I wrote a guide about fixing this by tricking your Mac into thinking your external monitor is internal. There is a common problem on unsupported external monitors where Night Shift will become permanently enabled, and will even stop Night Shift's scheduling and intensity settings from working properly on the Mac's internal monitor. Enjoy Free Shipping Worldwide Limited Time Sale Easy Return. Find more Computer & Office, Laptop Parts and Laptop LCD Screen products. However do be wary that Night Shift is not officially compatible with any displays besides the internal Mac displays, the Apple Thunderbolt Monitor, and the LG UltraFine 4K/5K monitors. The mid 2015 Apple MacBook Pro a1398 Mjlq2ll/a features a 22 nm Haswell/Crystalwell 2.2 GHz Intel Core i7 processor (4770HQ), with four independent processor cores on a single silicon chip, a 6 MB shared level 3 cache, 16 GB of onboard 1600 MHz DDR3L SDRAM and 256 GB of PCIe-based flash storage. Buy MID 2015 EMC2909 A1398 LCD Screen Assembly For Apple Macbook Pro 15 Retina LCD Screen MJLT2 MJLQ2 2880x1800 at Aliexpress for CN 2,404.94 - 2,794.94.
After connecting the monitor, just head to System Preferences>Display> Your Monitor and hold option while clicking the "Scaled" radio-button to show a full list of available resolutions. You will likely have to set the resolution manually though.
On top of that you should have no issue running a resolution of 3840x1600 on an external monitor via your MacBook. Yes, Thunderbolt 2 is indeed compatible with DisplayPort 1.2.