The playbook
Website Speed Optimization: Checklist
Use this website speed optimization checklist before a new release, a handoff, or a scheduled review. Its purpose is to verify the decisions that affect load and interaction delays. Check an actual page or interaction record; a box marked complete without evidence does not show that the customer journey works.
Put the task in context
Identify the resource or interaction causing delay before applying broad changes. Large hero images, unnecessary scripts, and slow server responses need different fixes. Retest the full user journey after optimization so reduced load time does not conceal broken functionality.
Before you use the checklist
Name the exact item being checked and its purpose. Gather template, bottleneck, change, measurement. If one of those details is unknown, mark it as unknown and assign a way to resolve it. An invented value makes the checklist look complete while weakening every later decision.
Working checklist
| Check | Evidence to keep | Responsible role |
|---|---|---|
| Measure important templates under representative conditions | A dated observation showing how template was verified | website lead |
| Identify large assets blocking resources and slow responses | A dated observation showing how bottleneck was verified | designer or developer |
| Test one bottleneck at a time and verify functions still work | A dated observation showing how change was verified | site owner |
Check the failure path
- Look specifically for this failure: optimizing a score while breaking images forms or useful content.
- Pair performance measurements with complete journey tests. Record the actual correction, not just the intention to make it.
- Repeat the affected task after the correction and check measurement.
- Make sure the next owner can find the decision and supporting evidence.
Use three outcomes for each check
Mark an item as complete only when the expected behavior or information has been observed. Mark it as incomplete when a required condition is absent. Use not applicable when the condition genuinely does not belong to the chosen scope, and write a short reason. These states keep a review useful without forcing every process into an identical mold.
For example, if the check is “Measure important templates under representative conditions,” a meeting about the subject is not the evidence itself. Retain the relevant template and bottleneck, the decision made from them, and the result of checking that decision. The record should allow someone who missed the meeting to understand what changed.
Decide what must be resolved first
An incomplete item that prevents reduce avoidable delays in loading and interacting with a website deserves attention before a cosmetic improvement. Assign an owner and a next action to that issue. Keep optional refinements visible, but do not let them obscure a failure in the core process.
Close the review
Recheck corrected items and note anything still uncertain. The checklist is finished when the next owner understands what was verified and what remains open. Follow load and interaction delays using a consistent definition so later reviews can connect execution quality with useful results.
Design recovery as part of the experience. People enter incomplete information, use slow connections, and return to interrupted tasks. A clear error and a preserved input are often more useful than another decorative element.
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