See more: What is Onpage SEO? 20+ Effective Onpage SEO Optimization Checklist 2024 Optimize Spa service images Spa service images are an important part of a standard SEO article. However, Spa images also need to be optimized so as not to slow down page loading speed and be friendly to viewers and search engines. Image size : Use and create Spa service images that are small, compact, not too heavy but still maintain quality.