Network Conditioning

Network Conditioning lets you add artificial latency to specific requests, simulating real-world conditions like slow APIs, high-latency servers, or sluggish network connections.

How It Works

Network Conditioning rules add configurable delays at two points in the request lifecycle:

• Request delay — pauses before the request is forwarded to the server, simulating slow upload or connection setup
• Response delay — pauses after the server response is received but before it’s sent to the client, simulating slow download or server processing time

Both delays are additive: the total latency your app observes is request delay + actual server time + response delay.

Delays are applied per-rule based on URL pattern matching — you can target specific endpoints rather than throttling all traffic.

Creating a Rule

1. Open the Network Conditioning tool from the toolbar

2. Click Add Rule

3. Fill in the rule details:

   • Name — a descriptive label (e.g., “Slow API”)
   • URL Pattern — a glob pattern to match URLs (e.g., https://api.example.com/*)
   • Method — optionally restrict to a specific HTTP method (GET, POST, PUT, etc.), or leave as “Any” to match all methods
   • Request Delay — milliseconds to delay before sending the request (e.g., 500)
   • Response Delay — milliseconds to delay before delivering the response (e.g., 500)

4. Enable the rule

   

Tip

You can also create a rule by right-clicking a request in the request list and selecting the network conditioning option. The URL pattern will be pre-filled with a default of 500ms for each delay.

Managing Rules

• Toggle individual rules on or off using the toggle switch next to each rule
• Toggle all rules at once using the global enable/disable button
• Sort rules by name, creation date, or last updated date
• Edit or delete rules at any time

When multiple rules match the same request, the oldest rule (earliest creation date) takes priority.

Note

Free accounts are limited to 3 Network Conditioning rules. Upgrade to Pro for unlimited rules.

Example Configurations

Here are some common delay values for simulating different conditions:

Scenario	Request Delay	Response Delay
Slow API response	0 ms	2000 ms
High-latency connection	500 ms	500 ms
Slow upload	1000 ms	0 ms
Very slow mobile	1500 ms	3000 ms

Use Cases

• Performance testing — verify your app loads acceptably when APIs are slow
• Loading state testing — ensure loading spinners and skeletons display correctly
• Timeout testing — verify timeout handling with high-latency conditions
• Race condition debugging — slow down specific requests to expose timing issues
• Mobile simulation — approximate slow mobile network conditions on desktop