To run AutoCAD Civil 3D 2018.1.1 smoothly, your system should meet or exceed these official specifications : System requirements for AutoCAD Civil 3D 2018 - Autodesk
Autodesk AutoCAD Civil 3D 2018.1.1 is an essential update for civil engineering professionals, combining the robust infrastructure design tools of the Civil 3D 2018 core with specialized enhancements for road rehabilitation, pipe networks, and drawing efficiency. This version addresses critical design workflows and provides significant stability fixes over the initial 2018 release. autocad civil 3d 201811 full version new
: New commands to easily create and place model views onto layouts with automatically sized viewports. System Requirements for Optimal Performance To run AutoCAD Civil 3D 2018