From our experience, RAM is not the limiting factor. It's the CPU. You need at least 1 CPU core for the modern browsers to work reliably at scale so if you're using a container that has 1GB ram and 0.25 core, it's just not worth it. If you have access to containers that have strong CPUs and not a lot of RAM, then it's a different story.
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In crawlee, you can use the useIncognitoPages option to create a separate context for each page https://crawlee.dev/api/browser-pool/class/LaunchContext#use... Not sure if it will be enough to offset your RAM requirements.
From our experience, RAM is not the limiting factor. It's the CPU. You need at least 1 CPU core for the modern browsers to work reliably at scale so if you're using a container that has 1GB ram and 0.25 core, it's just not worth it. If you have access to containers that have strong CPUs and not a lot of RAM, then it's a different story.