"Construction speed" really feels like the wrong phrase to use. Maybe "pace of construction"? I'm not sure. The thing to understand is that in all the large

"Construction speed" really feels like the wrong phrase to use. Maybe "pace of construction"? I'm not sure. The thing to understand is that in all the large cities all over the world, there are multiple construction crews working concurrently on individual projects. "Construction speed" feels like it would be describing a single crew working on a single project. In addition, there are plenty of internet communities where people track construction projects, and if you read through those you'll see that there are a lot of variables that influence how quickly a skyscraper can be built. The soil plays a large role - how stable, what material, how close is bedrock, etc. The foundation of a skyscraper is extremely complicated and expensive, and the time it takes to construct is hyper-specific to the location. Just one example.