Performance optimization for faster websites and better core web vitals
Fix specific charging time brakes and measure the difference
When websites seem slow, core web vitals are unstable, or templates, scripts, and assets slow down delivery, it takes more than just quick shots. The aim is to cleanly prioritize the largest technical brakes and to improve performance-relevant levers in a structured manner.
- Personal care
- Agreed scope of services
Example job: A shared script blocks interactions
Illustrative process · no published customer case. The binding scope is agreed in advance.
What you bring
Confirmed bottlenecks, affected page types and a suitable test environment.
What we are investigating
We process the agreed cause and compare the same process before and after the change, including possible functional sequences.
What you continue to work with
You will receive the coordinated change, reproducible measurement conditions and instructions for further observation in productive operation.
Performance limits
A local improvement does not guarantee identical results on all devices. Third-party providers and hosting can limit the reachable scope.
Typical performance problems
- Large or poorly delivered assets slow down critical page types
- JavaScript, third-party scripts or rendering logic delay content
- Templates create unnecessary load or unstable layouts
- Important landing pages, categories or product pages suffer disproportionately
For whom the service makes sense
- Companies with performance-critical performance or transaction pages
- Agencies with relaunch, shop or CMS projects
- In-house teams with CWV or charging time issues
- Websites with complex templates, tracking or many components
What is included
- Analysis of the largest technical performance brakes
- Prioritization by SEO, UX and Business Relevance
- Recommendations for rendering, assets, templates, third-party and delivery
- Optional review or monitoring of implementation
- Post-check of central side types and levers
What they receive
- Clearer order instead of unsorted performance tips
- Better focus on really relevant brakes
- Cleaner technical basis for Core Web Vitals and UX
- More clarity for development, product or agency
How optimization typically works
Prioritize Page Types
Which pages count first in performance
Identifying brakes
Clean templates, assets, scripts and rendering
Improving Core Web Vitals
Prioritize LCP, CLS, INP-relevant causes
Derive technical measures
What should be improved in the short term and what should be structurally improved
Implementation review
whether performance measures are technically correct
Post-control
Check if the main page types have become more stable
Why Seitenreport
Seitenreport combines technical test data, real error patterns and practical implementation logic. This does not stop at an evaluation, but leads to concrete improvements to the website.
This is especially valuable for grown websites, relaunch episodes, CMS setups and projects where many problems are related.
The free analysis and SEO tools are a good place to start. The service is about classification, prioritization, action logic and – depending on the project – direct technical correction or review of the implementation.
Requests
Briefly describe starting position, affected URLs or page types, CMS/Setup and destination. In this way, it is possible to quickly assess whether direct remediation, upstream analysis, technical review or ongoing support makes more sense.
What you can do concretely
- Limited technical measures for selected page types
- Implementation suitable for CMS, hosting and existing infrastructure
- Comparable measurements before and after changes
In advance, we agree on the specific changes, required accesses and criteria for the follow-up audit. Additional tasks can be assigned separately.
What we vote before the start
Feasibility, accesses and tasks are checked in advance. Larger works or further sprints receive their own offer; no unlimited repair promise.
FAQ
Is it just about Core Web Vitals?+
No. Core Web vitals are important, but performance optimization also includes rendering, asset delivery, template brakes, scripts, and real-world user perception.
Is this also relevant for SEO?+
Yes. Slow websites can negatively impact crawling, user experience, conversion and technical quality signals.
Do you also work with developers or agencies?+
Yes. Collaboration can take place directly or as a technical review with development, agencies or in-house teams.
Can this be combined with technical SEO?+
Yes. Performance and technical SEO are often closely related, especially in rendering, structure and page delivery.
Your personal contact: Matthias Gläßner
Senior web developer with SEO focus · Founder and owner of Seitenreport · TYPO3 lecturer at GFU
18+ years of experience: Matthias Gläßner has been supporting companies, agencies, associations and public agencies in web projects since 2007. His focus is on technical SEO, performance, web architecture and the further development of grown websites.
You discuss your task directly with the responsible contact person. Technical test data, personal classification and coordinated priorities form the basis of the cooperation.
Non-binding requests
Briefly describe your plans. Matthias Gläßner will contact you personally.
Price limits: from 1,490 € per Sprint plus VAT