Polling vs Webhooks

Polling and webhooks are often presented as a simple modern-vs-old choice.

That is too shallow to be useful.

The real question is not which one sounds better.

It is:

How should this workflow learn that something changed?

That is an event-delivery question.

If you answer it badly, you can end up with:

• workflows that are slow for no good reason
• huge numbers of unnecessary API requests
• missed events
• brittle receivers
• false confidence that the integration is "real time" when it is not

So this lesson is about choosing the right delivery pattern for the job, not just repeating "webhooks are better."

The simplest difference

GitHub's webhook docs explain the distinction cleanly:

webhooks deliver data when something happens, while polling means calling an API intermittently to see if data is available.

That one distinction drives almost every tradeoff.

Polling

Polling means your system asks on a schedule:

• anything new?
• did anything change?
• is there something I should process?

Webhooks

Webhooks mean the source system says:

• something happened
• here is the event
• handle it now

That is the core model difference:

• polling is request-driven
• webhooks are event-driven

Why webhooks usually feel faster

Webhooks are usually better for near real-time automation because the event is delivered when it happens.

GitHub explicitly lists this as one of the main webhook advantages.

That matters in workflows like:

• payment succeeded
• order placed
• support ticket escalated
• lead form submitted
• deployment completed

If those workflows matter in the moment, waiting for the next polling interval creates avoidable lag.

Polling can still be made frequent, but that creates another tradeoff: the more often you check, the more requests you burn just to ask whether something changed.

Why webhooks usually scale better

GitHub also makes this point directly: webhooks scale better than repeated API calls when you need to monitor many resources.

That is one of the biggest practical reasons teams move toward webhooks.

Imagine a workflow watching:

• hundreds of repositories
• thousands of customers
• many ticket queues
• a large ecommerce catalog

With polling, your system may ask all of those resources the same question over and over even when nothing happened.

With webhooks, the source system only sends data when the event actually occurs.

That usually means:

• fewer wasted requests
• lower API consumption
• lower chance of hitting rate limits
• cleaner event timing

So why would anyone still use polling?

Because polling still solves real problems.

It is not obsolete. It is just different.

Polling is often the right choice when:

• the provider offers no webhook support
• the webhook support is incomplete
• you need scheduled reconciliation anyway
• your receiving environment cannot expose a reliable public endpoint
• the workflow only needs periodic updates

GitHub's own docs say that if you only need information once or intermittently, or only need a small amount of information with no plans to scale up, calling the API when needed can be enough.

That is a helpful rule.

Not every workflow needs an event stream.

The real operational tradeoff

The easy version of this comparison is:

• polling wastes requests
• webhooks are real time

That is true, but incomplete.

The deeper operational tradeoff is this:

Polling gives the receiver more control over timing

You choose:

• when to check
• how often to check
• how much to fetch
• how to pause or resume

That can be useful in systems that want deliberate, scheduled control.

Webhooks give the source more control over timing

The source system decides when deliveries happen.

That is good for freshness, but it also means your receiver has to be ready whenever the event arrives.

So the question becomes:

• do you want to control the checking schedule yourself?
• or do you want the source system to notify you as events happen?

That is usually the real architectural decision.

Polling is stronger for reconciliation than for immediacy

One of the most important reasons polling survives is reconciliation.

Polling is very useful when you want to compare system state on a schedule.

Examples:

• check for orders that should have synced but did not
• compare CRM records against billing records
• fetch all updated rows since the last successful run
• confirm that nothing was missed during downtime

That is different from event-driven handling.

Polling is not just a fallback for missing webhook support. It is also a strong pattern for:

• backfill
• scheduled reporting
• audit
• recovery

This is why mature systems often keep polling even after webhooks are added.

Webhooks are stronger for immediacy, but they ask more from you

Webhooks are efficient, but they are not free operationally.

GitHub's webhook best practices make that clear.

Reliable webhook handling usually means:

• subscribe only to the events you need
• validate deliveries with a secret
• use HTTPS
• respond quickly
• check the event type and action
• track deliveries and recover failures

GitHub even recommends responding with a 2XX within 10 seconds and moving heavier processing into a queue.

That is a big clue:

webhooks reduce unnecessary outbound requests, but they increase the importance of receiver design.

If your receiver is weak, webhooks can fail in noisy ways:

• timeouts
• duplicates
• replay attacks
• missed retries
• overloaded handlers

So webhooks are not "better" in a vacuum. They are better when the receiving side is designed well.

Polling mistakes teams make

Polling looks simple, so teams often underestimate its costs.

Mistake 1: Polling too frequently without a real need

This creates load with little benefit.

Mistake 2: Polling every record instead of using filters or timestamps

If the API supports "updated since" or event windows, use them.

Mistake 3: Treating polling as real time

It is not. It is interval-based.

Mistake 4: Ignoring rate limits

Frequent polling across many resources can become the integration's main scaling problem.

Mistake 5: No reconciliation logic

If you poll but still cannot tell what was missed, the workflow is weak in both speed and auditability.

Webhook mistakes teams make

Mistake 1: Assuming webhooks are enough by themselves

They often need a companion reconciliation process.

Mistake 2: Doing heavy work inline

Acknowledge quickly and process later.

Mistake 3: Treating delivery as guaranteed and singular

Retries and duplicates are normal integration realities.

Mistake 4: Subscribing to everything

Noise is operational cost.

Mistake 5: No observability

If you cannot trace deliveries, you do not really own the integration.

When polling is the better fit

Choose polling when:

• webhook support does not exist
• near real-time timing is not important
• you need regular state comparison
• the receiving side cannot expose secure inbound endpoints
• the dataset is small enough that scheduled checks stay cheap

That is especially common in:

• internal reporting jobs
• nightly syncs
• low-volume admin workflows
• recovery workflows

When webhooks are the better fit

Choose webhooks when:

• event freshness matters
• the source supports webhooks well
• the workflow needs quick downstream action
• request waste matters
• the number of monitored resources is large

That is common in:

• payments
• support escalations
• CI/CD
• lead capture
• order and shipping updates

The strongest pattern is often both

This is the practical answer most teams eventually arrive at.

Use:

• webhooks for the main event-driven flow
• polling for scheduled reconciliation, recovery, and backfill

That hybrid design is often the most resilient.

The webhook gives speed. The polling job gives confidence.

So how should you decide?

Use this simple rule:

Choose polling if the main question is:

"What changed since the last time I checked?"

Choose webhooks if the main question is:

"Tell me immediately when this event happens."

That framing tends to produce better architecture than generic advice.

The next lesson, REST APIs vs Webhooks for Automations, sharpens the comparison even further, because polling vs webhooks is a delivery-model choice, while REST APIs vs webhooks is a request-response vs event-pattern question. Teams often blur those together even though they are solving different design problems.