when does sentry sent web-vitals and performance data?

[zengzuo613]

I found that sentry is reported 1 second after the page is loaded

// part-1
public constructor(
    transactionContext: TransactionContext,
    private readonly _idleHub: Hub,
    /**
     * The time to wait in ms until the idle transaction will be finished. This timer is started each time
     * there are no active spans on this transaction.
     */
    private readonly _idleTimeout: number = DEFAULT_IDLE_TIMEOUT,
    /**
     * The final value in ms that a transaction cannot exceed
     */
    private readonly _finalTimeout: number = DEFAULT_FINAL_TIMEOUT,
    // Whether or not the transaction should put itself on the scope when it starts and pop itself off when it ends
    private readonly _onScope: boolean = false,
  ) {
    super(transactionContext, _idleHub);

    if (_onScope) {
      // There should only be one active transaction on the scope
      clearActiveTransaction(_idleHub);

      // We set the transaction here on the scope so error events pick up the trace
      // context and attach it to the error.
      __DEBUG_BUILD__ && logger.log(`Setting idle transaction on scope. Span ID: ${this.spanId}`);
      _idleHub.configureScope(scope => scope.setSpan(this));
    }

    this._startIdleTimeout();

// part-2
private _startIdleTimeout(endTimestamp?: Parameters<IdleTransaction['finish']>[0]): void {
    this._cancelIdleTimeout();
    this._idleTimeoutID = setTimeout(() => {
      if (!this._finished && Object.keys(this.activities).length === 0) {
        this.finish(endTimestamp);
      }
    }, this._idleTimeout);
  }

// part-3
export const DEFAULT_IDLE_TIMEOUT = 1000;
private readonly _idleTimeout: number = DEFAULT_IDLE_TIMEOUT,

is true? Premature data collection may lead to missing data or small values, such as cls and lcp

[AbhiPrasad]

We've made improvements to this in our latest release: https://github.com/getsentry/sentry-javascript/releases/tag/7.42.0

Please give it a try and let us know what you think!