To correct this problem, first, try changing your resolution and color settings. Try setting your computer to a resolution of 800 x 600 pixels, with 256 colors and a refresh rate of 60 Hz. Then increase your resolution and color display settings from there. Check with your OS manufacturer on how to adjust your screen resolution (e.g. Microsoft's Change screen resolution for Windows 10).
If a project was originally written in a previous version and has not been mass compiled up to the current version, it could be causing the slowdown. From the top-level VI, do a Save All by going to File >> Save All. Also, try running a mass compile on the project that is showing the slowdown of the development environment.
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