Espresso Shots Running Too Slow? Here's How to Fix It

If your shot takes longer than 35 seconds to pull a 1:2 ratio (e.g. 18 g in / 36 g out), it's running too slow. You'll usually notice:

• Espresso drips instead of streams
• The pump sounds strained or louder than usual
• The shot is dark, blonde-streaked at the end, and tastes harsh
• In extreme cases the machine "chokes" — almost nothing comes out, and pressure backs up

This is over-extraction territory, and the shot will almost always taste bitter.

The number one cause. Fine grounds pack tightly and don't let water through.

Fix: Move your grinder one step coarser. Pull another shot. Repeat until the time drops back into the 25 to 30 s window.

On a Breville Barista Express, you'll often need grind 6 to 8 with fresh medium-roast beans. On a DeLonghi Dedica, around 12 to 16. If you're at the coarsest setting and still slow, the issue is dose, distribution, or stale machine maintenance — not grind.

If you cram 20 g into a basket designed for 18 g, the puck swells against the shower screen when wet, leaves no headspace, and chokes the flow.

Fix: Drop the dose by 1 g and re-test. Use the screw-in razor tool that came with your Breville (if you have one) to scrape off excess coffee to the correct level after tamping.

A genuinely too-hard tamp is rare — most people don't tamp hard enough. But twisting or polishing the puck can compress the surface and make it harder for water to penetrate evenly.

Fix: Tamp once, straight down, with firm even pressure. No twisting, no polishing. The bench test: rest the tamper on the puck — if it doesn't sink under its own weight, that's enough pressure.

Old coffee particles, oils, and limescale clog the holes in the shower screen and the basket, reducing water flow.

Fix:

• Soak the basket and portafilter in hot water with a Cafetto / Puly tablet for 15 minutes once a week
• Backflush the machine with a blind basket and cleaning tablet weekly (Breville machines)
• Descale every 2 to 3 months — see our descaling guide

If you've never cleaned a machine that's months old, this alone can fix a chronic slow-shot problem.

Many entry-level Breville and DeLonghi machines ship with "pressurised" baskets (sometimes called dual-wall baskets) designed for pre-ground supermarket coffee. They have a tiny single hole at the back that artificially creates pressure.

If you put properly ground fresh coffee into a pressurised basket, that single hole becomes a bottleneck and the shot trickles out forever.

Fix: Switch to the single-wall (non-pressurised) basket that came with the machine. The single-wall basket has dozens of small holes spread across the bottom. Once you switch, you'll need to dial in your grind from scratch — go finer than you'd think, around grind 6 to 8 on a Breville Barista Express.

Use this order to diagnose a slow shot:

1. Are you using the single-wall basket? If not, switch. 2. Is the dose at or below 18 g? If not, drop it. 3. Is the grind at the finer end of the dial? If yes, coarsen 1 to 2 steps. 4. When did you last clean the basket and backflush? If "never" or "can't remember", clean it. 5. When did you last descale? If over 3 months ago, descale.

If you've done all of this and shots are still slow, the pump or solenoid valve may be failing — at that point it's a service issue rather than a dial-in issue.

Slow shots are often a combination of factors — grind, basket, dose, and cleanliness all stacking up. If you've tried the steps above and nothing works, our AI barista can walk you through it based on your exact machine and recipe, or you can talk to a real home espresso expert for photo-based help.