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Showing content from https://github.com/vuejs/vue/issues/4990 below:

Memory leak · Issue #4990 · vuejs/vue · GitHub

2.0.2

https://jsfiddle.net/szzrLcr5/

With the dynamic binding setup as shown in fiddle:

      <tr v-for="r in rows" :key="r.id">
        <td>{{ r.name }}</td>
        <td v-for="c in columns" :key="c.id">
          <input type="text" v-model="testData[c.year][c.quarter][r.name]">
        </td>
      </tr>

Enter the numbers into the table for some time. The application gets slower until it crashes.

Suspicion is a memory leak, here are detailed steps:

Run the fiddle, go to Profiles -> Take Heap Snapshot

Go to Timeline and start the capture. Enter some numbers into the cells for 30 seconds. Stop the capture.

We can se a constant increase in Heap size going from ~20MB to ~360MB.

To assure, go to Profiles -> Take Heap Snapshot.

The snapshot size is ~300MB.

Normal operation after entering large set of numbers.

Memory keeps getting allocated and not being freed, which leads to application crash.

Some additional related points:

• Randomizing data through a procedure also leads to increase of memory (using button Randomize data will run it for 20 times)
• The rows and columns can be defined within data as regular properties or as computed properties, no difference in memory usage.
• By removing the reactivity of data (replacing $set with normal setters) the memory is not increasing.
• With normal setters in place to prevent reactivity, the data gets automatically reactive if we use <input type="number" ... > instead of <input type="text" ... >
• Data also gets automatically reactive if casting the model to number ( <input type="text" v-model.number=testData[xxx] ...>)

Windows 10 Pro [Version 10.0.10586] or Ubuntu 16.04 LTS
Google Chrome 56.0.2924.87 (64-bit)
(also happening with Microsoft Edge)

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