Only major hardware improvement in that period is Nvidia's GTX 1060/1070/1080 series graphics cards and faster PCI based SSD storage. CPUs and memory have barely moved.
Until Ryzen forced Intel to get off their asses there was very little performance improvement generation by generation in intel processors.
For example: Over 2011 - 2017 there was a ~18% (userbenchmark) improvement in the *700 i7 model.
https://cpu.userbenchmark.com/Compare/Intel-Core-i7-2700K-vs...
But then Ryzen came out and the very next model (released in the same year) was already a ~23% improvement.
https://cpu.userbenchmark.com/Compare/Intel-Core-i7-7700-vs-...
However, both in the SC Mixed results on the benchmarks you linked, and in individual benchmarks at Anandtech ( https://www.anandtech.com/bench/product/2255?vs=2127), the single threaded results track previous generations.
Intel still had to go wide to increase performance due to competition from AMD. They didn't increase generational improvement on their individual cores.