Added a limit for loaded pages in dev

[lfades]

Closes #7059

[github-actions]

Stats from current PR

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	zeit/next.js canary	lfades/next.js 7059-ensure-page-limit	Change
Build Duration	15.4s	15.6s	⚠️ +194ms
node_modules Size	39.9 MB	39.6 MB	-339 kB
Total Bundle (main, webpack, commons) Size	209 kB	209 kB	✓
Total Bundle (main, webpack, commons) gzip Size	68.3 kB	68.3 kB	✓
Client _app Size	2.54 kB	2.54 kB	✓
Client _app gzip Size	1.05 kB	1.05 kB	✓
Client _error Size	8.19 kB	8.19 kB	✓
Client _error gzip Size	3.12 kB	3.12 kB	✓
Client pages/index Size	288 B	288 B	✓
Client pages/index gzip Size	222 B	222 B	✓
Client pages/link Size	4.83 kB	4.83 kB	✓
Client pages/link gzip Size	2.11 kB	2.11 kB	✓
Client pages/routerDirect Size	411 B	411 B	✓
Client pages/routerDirect gzip Size	296 B	296 B	✓
Client pages/withRouter Size	393 B	393 B	✓
Client pages/withRouter gzip Size	280 B	280 B	✓
Client main Size	23.3 kB	23.3 kB	✓
Client main gzip Size	7.63 kB	7.63 kB	✓
Client commons Size	183 kB	183 kB	✓
Client commons gzip Size	59.4 kB	59.4 kB	✓
Client webpack Size	1.49 kB	1.49 kB	✓
Client webpack gzip Size	769 B	769 B	✓
Base Rendered Size	1.34 kB	1.34 kB	✓
Build Dir Size	801 kB	801 kB	✓

Click to expand serverless stats

	zeit/next.js canary	lfades/next.js 7059-ensure-page-limit	Change
Build Duration	16.6s	16.5s	-113ms
node_modules Size	39.9 MB	39.6 MB	-339 kB
Total Bundle (main, webpack, commons) Size	209 kB	209 kB	✓
Total Bundle (main, webpack, commons) gzip Size	68.3 kB	68.3 kB	✓
Client _app Size	2.54 kB	2.54 kB	✓
Client _app gzip Size	1.05 kB	1.05 kB	✓
Client _error Size	8.19 kB	8.19 kB	✓
Client _error gzip Size	3.12 kB	3.12 kB	✓
Client pages/index Size	288 B	288 B	✓
Client pages/index gzip Size	222 B	222 B	✓
Client pages/link Size	4.83 kB	4.83 kB	✓
Client pages/link gzip Size	2.11 kB	2.11 kB	✓
Client pages/routerDirect Size	411 B	411 B	✓
Client pages/routerDirect gzip Size	296 B	296 B	✓
Client pages/withRouter Size	393 B	393 B	✓
Client pages/withRouter gzip Size	280 B	280 B	✓
Client main Size	23.3 kB	23.3 kB	✓
Client main gzip Size	7.63 kB	7.63 kB	✓
Client commons Size	183 kB	183 kB	✓
Client commons gzip Size	59.4 kB	59.4 kB	✓
Client webpack Size	1.49 kB	1.49 kB	✓
Client webpack gzip Size	769 B	769 B	✓
Serverless pages/link Size	342 kB	342 kB	✓
Serverless pages/link gzip Size	88.7 kB	88.7 kB	-1 B
Serverless pages/index Size	333 kB	333 kB	✓
Serverless pages/index gzip Size	86.3 kB	86.3 kB	-1 B
Serverless pages/_error Size	334 kB	334 kB	✓
Serverless pages/_error gzip Size	86.1 kB	86.1 kB	✓
Serverless pages/routerDirect Size	333 kB	333 kB	✓
Serverless pages/routerDirect gzip Size	86.3 kB	86.3 kB	✓
Serverless pages/withRouter Size	333 kB	333 kB	✓
Serverless pages/withRouter gzip Size	86.4 kB	86.4 kB	⚠️ +1 B
Build Dir Size	2.37 MB	2.37 MB	✓

[timneutkens]

I don't think this is the correct solution to the issue. What if you have these pages open and they get disposed. It would cause a refresh on those pages as they get disposed, causing them to recompile, which causes more work to be done, which then causes OOM again.

[lfades]

@timneutkens if there's a wait to check for pages that are not opened, that should do it, right ?

[timneutkens]

Going to close this as we need to think about it more.