Shopware 6 Issues and how to solve them

Anyone running a Shopware 6 store in 2025 is using one of the most flexible e-commerce platforms on the market. However, this flexibility brings with it increased technical complexity.

Unlike SaaS solutions, where infrastructure and operations are abstracted away, Shopware hands over full control of system architecture, caching, and data storage.This is an advantage—as long as the configuration is correct.

In practice, however, it becomes evident: When Shopware slows down or runs unstably, it is almost never due to the software itself, but rather invisible technical details.

At hyretech, we regularly optimize large Shopware Enterprise environments. In doing so, we repeatedly encounter the same bottlenecks.

Below are the four most common Shopware 6 problems in 2025—including proven solution approaches from the field.

Shopware Problem #1: The Admin Worker Performance Trap

Symptom

• Sluggish Shopware administration
• Delayed order confirmations
• Unreliable ERP synchronization

Cause

By default, Shopware processes background tasks (e.g., emails, indexing) via so-called Admin Workers, which are bound to logged-in backend users.This leads to:

• stopped jobs when no one is logged in
• competing processes when multiple admins are active
• increased CPU load and database deadlocks

Solution

In production systems, the Admin Worker should be deactivated.Instead, a server-side worker architecture is recommended, where background jobs run independently of user sessions via CLI processes (e.g., controlled by Supervisor or systemd).Result: stable processing, reproducible performance, no dependency on the backend.

Shopware Problem #2: 503 Errors with Large Categories or Campaigns

Symptom

• “503 Service Unavailable” during traffic spikes
• Log messages like “Header too long”

Cause

Newer Shopware versions use very granular cache tags to make product changes immediately visible.With large categories, these tags can generate HTTP headers that exceed standard Varnish limits.Varnish blocks delivery—not because of a bug, but because of a configuration that is too restrictive.

Solution

Adjustment of Varnish header limits to allow extensive cache tags to be processed.With correctly dimensioned header and workspace values, these errors can be permanently avoided.

Shopware Problem #3: The B2B Suite is Approaching End of Life

Symptom

• Cumbersome B2B portals
• Expensive customizations
• Low future-proofing

Background

The classic Shopware B2B Suite is no longer being actively developed in favor of B2B Components (API-first, close to Core).With Shopware 6.8 (planned for 2027), it will officially reach its End of Life.

Solution

For new projects, only the B2B Components should be used.Existing installations require an early migration strategy, as the data models differ significantly.Those who wait until shortly before the EOL risk costly and hectic restructuring.

Shopware Problem #4: Redis Misconfiguration and Lost Carts

Symptom

• Carts emptying during traffic spikes
• Users being unexpectedly logged out

Cause

In many setups, Redis is used simultaneously for:

1. HTTP Caching
2. Sessions
3. Carts

If Redis comes under memory pressure, it deletes keys according to the configured eviction strategy. If this is configured too globally, active shopping carts may be evicted to make room for less critical cache data.

Solution

The most important step is the clean separation of data types:

• separate Redis instances or databases for
  • ephemeral cache data
  • persistent data like sessions and carts

Tuning Tip:For carts, an eviction strategy makes sense that prefers removing expiring keys rather than indiscriminately deleting all data. This keeps active sessions protected, even under high load.Combined with correct memory sizing and monitoring, this problem can be permanently eliminated.

The Essentials on Shopware 6 Problems

Shopware 6 possesses a powerful architecture—but it demands professional operations.The difference between an unstable shop and a scalable platform often lies in details that users never see:

• Worker architecture
• Cache headers
• Redis strategies
• Infrastructure tuning

If deep Shopware, Symfony, or DevOps know-how is missing internally, these topics quickly become a risk.

At hyretech, we provide dedicated Shopware teams that not only develop features but systematically build up stability, performance, and scalability.

Is your Shopware store suffering from 503 errors, unstable carts, or slow admin performance?

Speak with hyretech to specifically identify these hidden technical bottlenecks and resolve them sustainably.

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