[Jules-GP]

Problem

The admin panel stuttered when scrolled: about 20 frames per second, with one frame in eight taking over 50 ms. The server was not the cause: it answers in a few milliseconds, and the page's 2-second redraw takes about 4% of the main thread.

Every card carried backdrop-filter: blur(28px) saturate(180%). While the page scrolls, what lies behind each card changes on every frame, so the browser can no longer just shift textures it has already painted. It reads back, blurs and saturates the whole area under every visible card, on every frame. With a GPU this is cheap. On Chrome in software rendering, common on Linux workstations, the CPU cannot keep up.

Change

• The cards (.card, #vitals on the admin panel, .card on the benchmark launch page, section, .legend and .arm on the benchmark page) keep their translucent --panel background, but lose the backdrop blur.
• The header bar keeps its blur, and so do the dialogs, the zoom view and the menus, which are small or fixed.

What shows through the cards is only the ground's wide colour glows, which are already soft, so the look barely changes.

Measured

Headless Chrome, 20 s of continuous scrolling on the admin panel:

	median frame	frames over 50 ms
before	50 ms (~20 fps)	58
after	16.7 ms (60 fps)	0

The server test suite passes, except test_dev_mounts, which also fails on main with a local tools checkout holding a tool the list does not know.

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