New laptop. I am using the Lenovo G50-80(kinda brotherhood of yours), and it is constantly running 2 cores 4 threads@2.62GHz. And, you can't overclock a U series CPU.
With core bumps from Intel and AMD in recent years (Since Late 2017), you better off start with a new laptop and upgrade it.
The i5-8250U for instance , is now 4 cores 8 threads @3.3-3.4GHz. This yield well over 100% compute performance increase.
with your 1TB SSD, you can get a i5-8250U + GeForce MX150, then replace the HDD.
You will feel the massive improvement.
NOTE: as Princess has said, be aware of your RAM.