I was comparing the identical laptops. The issue was in the dell power manager app I had set the thermal management to cool which compromises CPU performance. Now, it's working perfectly as I've set it to high-performance mod there.
Why my Laptop is giving almost half performance?  I have XPS 13 9360 i7 8th generation 8550u with 8 gb of RAM.  I just installed new windows and deleted everything. Why is performance that low? I've run geekbench 4, 5, 6 on my laptop and it is giving almost 50% of performance than others with same specs. Geekbench 6 scores for my laptop(Single core score 456 Multi core score 1631). Geekbench 6 scores of my friends laptop(Single core score 1309 Multi core score 3671). Why is that?
XPS 13 9360, Low Performance