Word Office Javascript API Perfomance

I would like to develop a Word Addinn. With which I can work my way through the paragraphs of a Word document and customize the formatting of the document. I would like to color the vowels of words in red. I have already developed a prototype. However, this is not particularly fast as everything is processed synchronously. I have not found a way to perform the processing asynchronously.

works

export async function run() {
  return await Word.run(async (context) => {
    const start = performance.now();

    const paragraphs = context.document.body.paragraphs;
    paragraphs.load("text");

    await context.sync();

    for (let i = 0; i < paragraphs.items.length; i++) {
      const paragraph = paragraphs.items[i];
      if (paragraph.text) {
        const wordsRangeCollection = paragraph.getRange().split([" "]);
        wordsRangeCollection.load("$none");
        await wordsRangeCollection.context.sync();

        console.log(wordsRangeCollection.items);
      }
    }

    await context.sync();

    const end = performance.now();
    console.log(`Execution time: ${end - start} ms`);
  });
}

not working

FAILURE
word-web-16.00.js:25 Uncaught (in promise) RichApi.Error

export async function run() {
  return await Word.run(async (context) => {
    const start = performance.now();

    const paragraphs = context.document.body.paragraphs;
    paragraphs.load("text");

    await context.sync();

    await Promise.all(
      paragraphs.items.map(async (paragraph) => {
        if (paragraph.text) {
          const wordsRangeCollection = paragraph.getRange().split([" "]);
          wordsRangeCollection.load("$none");
          await wordsRangeCollection.context.sync();

          console.log(wordsRangeCollection.items);
        }
      })
    );

    await context.sync();

    const end = performance.now();
    console.log(`Execution time: ${end - start} ms`);
  });
}

Both your implementations have a context.sync in a loop. (The map method is a loop in disguise.) This is a performance killer. Please use the techniques in this article to get the context.sync out of the loop: Avoid using the context.sync method in loops.