Is Celeron N4120 slow? 2026 limits, upgrade call, N100 comparison

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Is the Celeron N4120 slow in 2026? For light browsing and documents it still works. Chrome with many tabs, Zoom plus files, and photo work already feel tight. This chip is a late-2019 Gemini Lake Refresh part: 4 cores / 4 threads, 2.6 GHz max, TDP 6 W.

Can you still use a Celeron N4120 in 2026?

The Celeron N4120 arrived in late 2019 as a notebook CPU. It showed up mainly in entry notebooks in the 30,000–60,000 yen band, with these traits:

• 4 cores / 4 threads
• Max clock 2.6 GHz
• Low power (TDP 6 W)

A lot of cheap PCs of that era were 2-core. The N4120 at least has four cores.

With four cores, basic web and documents are still fine. Recent apps ask for more, so tight spots show up more often now.

Where a Celeron N4120 feels slow

The lag shows up most in scenes like these:

• Working in Google Chrome with many tabs open
• Zoom or Teams with files open at the same time
• Using current Chrome or Edge
• Editing photos from a phone

Browsers get heavier every year, so the gap versus a new PC is easy to feel. These are ordinary daily tasks, not heavy workloads. That is why the slowdown is annoying.

Why the Celeron N4120 is slow

The clock is low

The main reason is a low clock.

Other CPUs often boost to 3.6 GHz. The Celeron N4120 tops out at 2.6 GHz. Raising the clock would also raise power and heat, so this part of the design is expected.

RAM may be short too

Celeron PCs often shipped with little RAM. 4 GB is not rare.

Even a browser wants a lot of RAM now, so a short stick can keep the CPU from doing useful work.

If it is 4 GB, replace the PC. 8 GB can still limp along, but it is getting shaky. 12 GB or 16 GB is the comfortable range.

How far is N100 / N150?

The Celeron N4120 is a cheap-tier CPU. Compare it with N100, the cheap-tier name people talk about now.

The score is almost 2×. With N100-class scores, browsing and Word/Excel for ordinary work usually feel smooth.

Four cores on the N4120 still look weak next to that.

Replacement is the cleaner call

Even a browser wants a decent spec now. An older cheap CPU is already a tight fit.

CPU progress has been fast. Even N100, a budget grade, feels comfortable. Cheap units can land around 30,000 yen on Japanese listings.

Put together, spending a bit on a recent PC speeds up the work. That is a reasonable spend.

Celeron N4120 FAQ

RAM 4 GB to 8 GB vs a new ~30,000 yen N100: which is smoother for video calls plus many tabs?

Replacement is smoother. More RAM helps a 4 GB shortage, but video-call lag and tab stutter also come from the 2.6 GHz ceiling, so RAM alone does not fix it. N100 is about 2× on the score, so CPU-heavy use needs a new machine.

Phone photos: one simple edit vs dozens in a row — is N4120 enough?

One simple edit is enough on N4120. Dozens in a row keep loading and saving on the CPU, so waits stack up. If that is a daily job, look at N100 or newer.

~30,000 yen N100 vs ~50,000 yen N150: which replacement?

For everyday browsing and Office, the ~30,000 yen N100 is enough. Both N100 and N150 are about 2× an N4120, so ordinary use does not feel far apart. For light video work or a longer keep, take the ~50,000 yen N150 for headroom.