@elctrnx_lyf- I think you might be mixing up the 15% reduction at Rambus with the 250 job cuts at ON Semiconductor. Rambus has about 500 employees; 15% is about 75 jobs. ON Semi has something like 20,000 employees, so it's 250 job cuts translate into a lower percentage.
Is 15% significant? I would say so.
And for any of the people losing their jobs at ON Semi, Rambus, or elsewhere, it's pretty significant, regardless of the percentage.