# Optimization

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<table><thead><tr><th width="58">#</th><th>Title</th><th>Description</th></tr></thead><tbody><tr><td>1</td><td>Original Images</td><td>Percentages of original image types</td></tr><tr><td>2</td><td>Optimized Images</td><td>Percentages of optimized image types</td></tr><tr><td>3</td><td>Compression (JPEG --> WebP)</td><td>The percentage filesize difference of RESIZED images between WEBP and JPEG</td></tr><tr><td>4</td><td>Bandwidth savings</td><td>The percentage filesize difference between original and resized images</td></tr><tr><td>5</td><td>Formats: Original vs Variants</td><td>Number of original images and variants</td></tr></tbody></table>

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<table><thead><tr><th width="58">#</th><th>Title</th><th>Description</th></tr></thead><tbody><tr><td>1</td><td>HIT/MISS over period</td><td>The percentage of image status during selected period</td></tr><tr><td>2</td><td>Daily Request Count</td><td>Daily total requests per status</td></tr><tr><td>3</td><td>Origin Error requests (period)</td><td>Missing images or server errors when Cloudimage GET the Original</td></tr><tr><td>4</td><td>MISS (back to origin) daily peak</td><td>Missing both cache and transformed image on Cloudimage infrastructure</td></tr></tbody></table>

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<table><thead><tr><th width="58">#</th><th>Title</th><th>Description</th></tr></thead><tbody><tr><td>1</td><td>Delivery Node TTFB</td><td>Time To First Byte (from moment request is received on Cloudimage infrastructure)</td></tr><tr><td>2</td><td>TTFB (median)</td><td>Median time to first byte (the responsiveness of a webserver)</td></tr><tr><td>3</td><td>TTFB (80th percentile)</td><td>80th percentile of time to first byte (the responsiveness of a webserver)</td></tr><tr><td>4</td><td>TTFB (90th percentile)</td><td>90th percentile of time to first byte (the responsiveness of a webserver)</td></tr></tbody></table>