Over here, the problem is not with the costs associated with a single layout size this large, rather the time it will take to send all the data on your browser.
This will impact performance massively. Will definitely try to increase the 5 MB layout if feasible without impacting performance.
You can see how ‘Trade Tiger’ Desktop App works on Local save, All GTF traders use this for technical analysis which maintains all data without loss in any condition. If your team can review this it solve 5MB tension for many people who do more analysis with chart, Thanks Sir