TinyPNG records compression data on each attachment in the tiny_compress_images postmeta entry, with a serialized array of per-size results including original bytes, output bytes, and the compression date for the full size plus every thumbnail. The Bulk TinyPNG screen and the Media Library savings column show the headline totals, but the audit-shaped questions a performance team has after a few months live a layer down.

SleekView Charts reads the same postmeta and turns it into a configurable dashboard. Number cards show total bytes saved across the library. Pie cards split attachments by compression status (compressed, partial, pending, skipped). Bar cards rank image sizes by savings. Area cards trace savings by upload year so a performance lead can see which sections of the site benefit most from a focused round.

Every card reads through the postmeta TinyPNG already writes, so credit accounting, the bulk queue, and the per-image dialog remain authoritative. The dashboard answers the cross-cutting questions: how many credits did this month cost, which thumbnail size pulls the most weight, and how much of the library is still on the original format without a WebP or AVIF derivative.

Image compression is a long tail. The first bulk run handles the existing library, but every new upload, every newly registered thumbnail size, every plan upgrade, and every theme change adds rows that drift away from the clean baseline. TinyPNG records all of it on the attachment in postmeta the WordPress media library does not surface as columns, and the Bulk TinyPNG screen answers only the broad-strokes question of how much has been saved overall.

The audit-shaped questions a performance team has after a few months of operation, which year of uploads has the heaviest tail, which thumbnail size is pulling the most weight, what share of the library is still queued against the monthly credit allowance, live a layer down. SleekView Charts reads the same postmeta and gives those answers as a dashboard. The plugin keeps doing the compression work; performance leads, agencies, and editorial teams finally have the dashboard that turns guesses into precise per-size and per-year numbers.