> For the complete documentation index, see [llms.txt](https://help.screena.ai/resources/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.screena.ai/resources/faq/performance/how-do-you-ensure-horizontal-and-vertical-scalability.md).

# How do you ensure horizontal and vertical scalability?

Screena uses multiple threads by request. The response time per request (**latency**) is based on the server resources on which Screena is installed. To reduce latency, we can increase the **number of CPUs**. For higher volumes, we can also use **GPU processing**.

To increase the number of transactions processed per second (**throughput**), we can increase the **number of VMs** behind the load balancer (**auto-scaling** group in AWS). This means that the number of requests per second can be easily augmented without impacting the average response time.