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What model of the laptop are you using?
Most i5 models today have better single core performance (~32% faster) than 2011 i7s, while the multicore performance of the i7s being 1% faster in normal conditions and 17% faster when overclocked.
1. The brighter area of the screen might be fixable if it is screen burn. Google lcd screen burn repair and there is advice and free software that will attempt to fix it.
2. Laptop CPUs used to come in two varieties: performance and eco - the eco versions tended to perform on a par with the next level down, so an eco i7 would perform similar to a normal i5 and an eco i5 would perform similar to an i3. This could be why your old i7 is outperforming the new i5 so much.
As has been said: if the laptop you have does what you want then why upgrade? A computer is just a tool.
I'v adopted the "change the whole desktop once every +/-10 years" methodology.
Basically I get the best of the best (that is still affordable) every 10 years and that's it.
Last desktop lasted 8.5 years before things started to run slow or break.
For a desktop off around 2000 euros that's pretty good.
Current one is at 2 years (I think) and no signs of needing to be upgraded or anything yet so ...
I don't get laptops anymore or if I really really need one I just buy one of those 200euro ones that lasts only a couple months.
Laptops just don't last as long and are way more expensive and I really can't be bothered to shelf out that much cash for it.
Mr. Cooper assigned English homework to his 5th grade students: A rough draft Title and opening sentence for a story.
The next day reading through them while students worked on other materials, he came across Cyndi's work, reading: Gone with the Wind | Scarlett O’Hara was not beautiful, but men seldom realized it when caught by her charm as the Tarleton twins were.
He called Cyndi over and talked with her about original writing vs. plagiarism of a story; she understood and turned in another draft title & opening line: The Tempest | Once there were four children whose names were Peter, Susan, Edmund and Lucy.
Mr. Cooper again called Cyndi and noted that, while the title and opening line are unconnected, they are still from existing stories, so she tried one more time: The Antics of Coccyx Conjoined Felines | 2 X 2,4391.23 X square root(3423321)
Quite perplexed yet amazed, Mr. Cooper asked Cyndi to expound on what the title and opening line meant.
Cyndi replied, "The Tail of Two Kitties | It was the best of times, it was the worst of times."
The best way to improve Windows is run it on a Mac.
The best way to bring a Mac to its knees is to run Windows on it.
~ my brother Jeff