Hosting Glossary
What is OPcache?
OPcache in plain English — the definition, the analogy, and why it matters to anyone who runs a website.
The short answer
OPcache keeps compiled PHP bytecode in memory, so scripts skip recompilation on every request — free speed for every PHP site.
The sections below unpack it properly — how it works, why a site owner should care, and a concrete example of it in the wild.
Written by the HostingAlly team · Last revised 27 July 2026
0
Jargon left unexplained
100+
Linked definitions
Real
Platform examples
Free
To read, obviously
PHP normally parses and compiles source per request; OPcache does it once and reuses the result until files change. On WordPress-scale codebases the saving lands on every uncached request — admin screens included.
It's enabled by default on decent hosting (ours included) — the setting worth verifying rather than configuring, via any phpinfo view.
A picture that makes OPcache stick
Keeping the translated script on stage rather than re-translating the play before every performance — the actors start immediately, and only a rewritten scene triggers fresh translation.
Analogies simplify, of course — but this one holds up well enough to reason with, and reasoning is the point of a glossary.
What this means for your site
OPcache is the invisible baseline of PHP performance — its absence makes even fast hardware feel sluggish, and its presence is one of the quiet differences between tuned and merely-provisioned hosting.
That's the test for every technical term, incidentally — not 'do I understand it fully' but 'do I know when it's the answer to my problem'. For this one, now you do.
What it looks like in practice
A WooCommerce admin's dashboard — hundreds of PHP files per screen — runs on precompiled bytecode; the compilation that would dwarf the actual work happened once, days ago.
Ordinary, once seen — which is the point: most hosting concepts are simple machinery wearing intimidating names.
The HostingAlly angle
You'll meet it in the control panel and occasionally in a support conversation — usually already configured the right way. If this term made sense, the natural next reads are PHP, Cache, Redis and TTFB.
Annual plans include your first year of domain registration on us.
Why we wrote a hundred definitions
Every confusing term in hosting eventually becomes a support ticket — so we defined the hundred most common ones properly, once, in the plain English we'd use on the phone.
Daily automatic backups with one-click restores come with every plan.
- 100+ terms, plain English
- Analogies and real examples
- Cross-linked related concepts
- Written by the support desk
Why HostingAlly
Every plan includes this, whatever you pay
Grounded in a real platform
Examples reference the hosting you'd actually use, not abstract diagrams.
The practical stakes named
Not just what it is — when it's the answer to a problem you're having.
One term, fully landed
OPcache defined, pictured by analogy and placed in your own control panel — recognise-level in a single read.
Linked, not siloed
Related terms cross-reference, so one lookup becomes a working understanding.
Honest about what you can skip
Most terms are recognise-level, not operate-level — the glossary says which is which.
The next reads, mapped
This entry connects to PHP and Cache — concepts travel in packs, and the pack is linked.
Getting Started
How to get going
- 1
Spot it in your own setup
The fastest way to learn a hosting term is to find it in your own panel — five minutes of looking beats an hour of reading.
- 2
Check the defaults
Confirm how your account has this configured — usually correctly by default here, and now you'll know rather than guess.
- 3
Follow the related terms
Concepts travel in packs — PHP, Cache and Redis complete this one's picture, and each is a two-minute read away.
Included
What's covered on our plans
- WordPress Toolkit with automatic updates
- cPanel — the industry-standard control panel
- Webmail plus IMAP, POP and SMTP access
- One-click installer for WordPress and 400+ apps
- Renewal prices that match signup prices
- SSH, Git and Composer access on developer-friendly plans
- Free website migration handled by our team
- NVMe SSD storage as standard
- Per-site PHP version selection
- No setup fees, ever
FAQ
Your questions, answered
Do I need to configure OPcache myself?
On managed hosting, no — enabled and sized by the platform. On a VPS, enable it with sane memory settings in php.ini; it's among the highest-yield lines in the file.
OPcache versus Redis — don't they overlap?
Different layers — OPcache caches compiled code (how to compute); Redis caches data results (what was computed). Full-stack PHP tuning runs both; neither substitutes for the other.
Will you move my existing website for free?
Yes — open a ticket with your current host's access details and we handle the whole move: files, databases, email and configuration, verified by you before DNS switches. The old site keeps serving until the new copy takes over, so visitors never see a gap.
Which control panel do you provide?
cPanel — the industry standard, which means every tutorial on the internet matches your screen, your backups restore anywhere cPanel runs, and skills learned here transfer for life. Plesk and DirectAdmin options exist on specific plans for those who prefer them.
Are backups included, and can I restore them myself?
Daily automatic backups are standard, restorable from the panel in minutes — files, databases or both, at 3am without a ticket if that's when you need it. For extra cover, you're welcome to run your own offsite copies alongside.
What happens to my data if I cancel?
Your site and files remain yours — download a full backup from the panel any time, before or during cancellation. Domains stay registered to you for their paid term and can transfer to any registrar after the standard 60-day window.
Where are your servers located?
Our hosting infrastructure runs from European datacentres with London at the core, behind server-level caching that keeps cached pages fast worldwide. For most sites, platform quality — NVMe storage, LiteSpeed, sensible server density — matters far more than the datacentre's postcode.
Keep exploring
Cache
A cache stores the results of expensive work for instant reuse.
TTFB (Time To First Byte)
TTFB measures the delay between requesting a page and receiving its first byte — the server-and-network share of perceived speed.
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