Mobile Browser profiling and optimization

### What is this about?

Current browser performance issues:
- Reports from internal&external users mentioning general "slow performance and clunkiness", especially on lower-end devices
- Page load feels slow at times
- Biggest offender is a homepage - Portfolio, the issue there is likely on the site itself
- Browser tabs are reloaded any time you switch the tab or switch from-to the browser, which adds to the feeling of slow performance

Tactics:
1. Profile page load on a list of top dapps against top competitors and native mobile browser
2. Explore the possibility of caching the recently active tabs to speed up switching between dapps

Linked JIRA initiative: https://consensyssoftware.atlassian.net/jira/polaris/projects/MWMR/ideas/view/8845676?selectedIssue=MWMR-19&issueViewSection=deliver

### Scenario

_No response_

### Design

_No response_

### Technical Details

_No response_

### Threat Modeling Framework

_No response_

### Acceptance Criteria

_No response_

### Stakeholder review needed before the work gets merged

- [ ] Engineering (needed in most cases)
- [ ] Design
- [ ] Product
- [ ] QA (automation tests are required to pass before merging PRs but not all changes are covered by automation tests - please review if QA is needed beyond automation tests)
- [ ] Security
- [ ] Legal
- [ ] Marketing
- [ ] Management (please specify)
- [ ] Other (please specify)

### References

_No response_

Start by profiling page loads for a list of top dapps against competitors and the native mobile browser, then investigate why browser tabs reload when switching between them. The issue provides no files, tests, or acceptance criteria; completion would require measured performance improvements and a defined approach for caching recently active tabs.

Written by the indexing model from the issue text.