Attempt to fix consistent shinyjster failures

[schloerke]

• [x] App 147-websocket
• [x] App 163-select-factor
• [x] App 200-flexdashboard-render-text
• [x] App 900-text-jster

[schloerke]

Fix made in shinyjster. Going to remove app slowdown change as that was not the cause.

[schloerke]

There are green lights all around. Merging