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Cloudflare Tests Cache Compression: When Disk Savings Help Hosting and When They Harm It

In Cloudflare's experiment, cached data occupied less space thanks to Zstandard. I analyze why compression must be evaluated alongside CPU load and latency.

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Server drives and a spare disk on the work surface
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On September 1, 2026, Cloudflare announced an experiment compressing its own cache content. The approach uses Zstandard: suitable data is stored more compactly and decompressed before delivery. Since the company describes a prototype, it cannot be treated as a ready-to-use setting for any website.

For a hosting owner or a large store, the principle here is interesting: disk space can be exchanged for additional computational work. Whether this exchange is beneficial depends on the nature of the data and where the system is already hitting a bottleneck.

Not all files compress equally

Text data and pre-processed photos behave differently. Re-compressing a format that is already well-packaged may yield little benefit, while the CPU still spends time processing.

Therefore, before enabling the new scheme, you should analyze what occupies the storage: original images, derived thumbnails, logs, temporary files, or page cache. Sometimes the main problem is not the storage format, but the uncontrolled accumulation of old copies.

It is best to start with a small representative sample. Compare file size, read/write times, and resource usage under multiple concurrent requests. A good result on a single file does not describe the entire catalog.

Cache compression and page acceleration are different tasks

Internal storage of compact data can reduce disk usage and inter-node transfer. However, visitors judge the time until the page is ready. If decompression adds latency in an overloaded system, local savings do not necessarily improve their experience.

For a store, the difference between a cache hit and the first request after cache clearing is especially important. In the latter case, the server may need to fetch data, generate the page, and prepare it for storage. This mode should be tested before a sale or a major catalog update.

Personal data must not be cached blindly. The shopping cart, individual prices, and personal account require rules that do not mix content from different users. A new data compression algorithm does not replace these caching rules.

Consider the effect on the entire system

Include disk usage, CPU load, response time, and maintenance costs in the final comparison. Reducing one metric is useful only if it does not create a more expensive problem elsewhere.

The Cloudflare experiment indicates the direction of engineering work, not a universal recipe. For a specific site, I would first look for measurable overspending and test a limited hypothesis. This approach helps improve infrastructure without promising that a single setting will speed everything up at once.

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