Try responsive placeholder images from MoqImg. The service has high response speed and stable availability, designed to handle concurrent requests well. MoqImg uses a clean URL structure that works perfectly with lazy-load: just put moqimg.xyz/{width}x{height}.{format} in your data-src attributes. You can test lazy loading behavior with various image sizes from 10 to 4000px. MoqImg supports WebP and AVIF which are the formats you would likely use with lazy loading for performance. No rate limiting or API keys needed. MoqImg is completely free with no usage limits, perfect for running extensive test suites.
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