Problems optimizing redis

I have some webscraped data. I’m using redis as my server and fetching data from nodejs and displaying it in react.

This is what I have:

2 redis keys both ~ 200kb (so far, this will become ~10-20 mb in the future)

I fetch data from redis by getting both keys, parsing the data and then sending it. Just to note I’m storing data as one big string in the keys.

express:

 try {
    // Fetch redis data
    const data1 = await GET_ASYNC('data1');
    const data2 = await GET_ASYNC('data2');

    // Parse data
    const parse1 = JSON.parse(data1);
    const parse2 = JSON.parse(data2);

    const result = [...data2, ...data1];

    res.send(filterResults);

  } catch (err) {
    
    //
  }

The problem is that nodejs takes about ~2000ms to fetch and send the data, for my situation I need to lower this to 500ms or less. How could I do this? Is my problem in nodejs or how I’m storing data in redis? Thanks.