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# Size your environment
Sizing an environment means translating three things into resources: how many users it has, how many work at the same time, and which applications they use.
### What determines the size
* **Concurrent users**: what determines the load is how many users work at the same time, not the total number of registered users.
* **Application profile**: a light office workstation does not consume the same as one with a demanding ERP. The heavier the applications, the more resources per user.
### The platform's recommendation
When deploying, we suggest a starting size based on the users and applications planned. It's a sensible starting point: you can accept it or choose another configuration. With demanding applications, it's best to test with a group and monitor actual usage before rolling it out more broadly.
### One server or several
An environment starts with one server. When the load grows, you add servers and the environment becomes **multi-server**.
* Users are distributed among the servers through a **load balancer**, which distributes sessions.
* That way you add capacity without rebuilding the environment: you grow as your customer grows.
### Adjust when the load changes
Sizing is not final. You adjust the server resources from the **Servers subscription** associated with the environment, or add servers, as demand evolves and without starting from scratch. The number of users who can log in at the same time is controlled from the **Licenses** section of the Remote Desktop subscription.
### Templates for reuse
If you set up similar environments for several clients, the **server templates** let you reuse a base configuration and deploy consistent environments, without redoing the work every time.
### Where to go next
* Who connects and how: [Connection modes and permissions.](/docs-en/productos/remote-desktop/concepts/connection-modes.md)
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