getPerformance shows `[null, null]`

[Derek Chiang]

I've followed the instruction in the README to add a route for monitoring cache performance:

app.get('/api/cache/performance', (req, res) => {
  res.json(apicache.getPerformance())
})

However, when I visit this route, all I get is the following JSON response:

[null,null]

Does that mean that my cache is not being hit at all?

[Derek Chiang]

I realized that I had to set trackPerformance: true