Nuxt PM2 CPU up to 100% - vue.js

Question

Hello guys can you help me please!
My app use up to 100% CPU when a lot of users go to my app.
I tried a lot of things, and my config turned into a mess
This is my nuxt.config.ts.
import type { NuxtConfig } from '#nuxt/types';
const isDev = process.env.NODE_ENV !== 'production';
const mainConfig: NuxtConfig = {
...
build: {
cache: true,
optimization: {
minimize: true,
runtimeChunk: true,
concatenateModules: true,
splitChunks: {
chunks: 'all',
minSize: 30000,
maxSize: 0,
minChunks: 1,
maxAsyncRequests: 20,
maxInitialRequests: 3,
automaticNameDelimiter: '~',
name: true,
cacheGroups: {
vendors: {
test: /[\\/]node_modules[\\/]/,
priority: -10,
chunks: 'all'
},
default: {
minChunks: 2,
priority: -20,
reuseExistingChunk: true
}
}
}
},
filenames: {
app: ({ isDev }) => (isDev ? '[name].js' : 'js/[name]/[contenthash].js'),
chunk: ({ isDev }) => (isDev ? '[name].js' : 'js/[name]/[contenthash].js'),
css: ({ isDev }) => (isDev ? '[name].css' : 'css/[contenthash].css'),
img: ({ isDev }) => (isDev ? '[path][name].[ext]' : 'img/[contenthash:7].[ext]'),
font: ({ isDev }) => (isDev ? '[path][name].[ext]' : 'fonts/[contenthash:7].[ext]')
},
extend(config, { isClient }) {
config.externals = [
function (context, request, callback) {
if (/(pdfmake)/.test(request) || /(xlsx)/.test(request)) {
return callback(null, 'commonjs ' + request);
}
callback();
}
];
}
},
router: { ... },
modules: [ ... ],
server: { ... },
watchers: {
webpack: {
ignored: ['**/node_modules', 'node_modules']
}
}
};
export default mainConfig;
The application does not stand up to 2000 users and breaks,
I really dont know what to do! :(
Maybe you will can help me?