Facebook, Twitter, YouTube, and Microsoft (MSFT) last year signed up to a voluntary code of conduct to take action in Europe within 24 hours, following rising concerns about the proliferation of racist and xenophobic content on social media triggered by the refugee crisis and attacks in Western Europe.

This included removing or disabling access to the content if necessary, better cooperation with civil society organizations, and the promotion of “counter-narratives” to hate speech.

Facebook (FB) assessed notifications of hateful content in less than 24 hours in 58% of cases, up from 50% in December, according to a report by the European Commission, the main results of which were seen by Reuters.

Twitter (TWTR) also sped up its dealing with notifications, reviewing 39% of them in less than 24 hours, as opposed to 23.5% in December, when the Commission first reviewed the companies’ progress and warned them they were being too slow.

YouTube (GOOGL), on the other hand, slowed down, reviewing 42.6% of notifications in less than 24 hours, down from 60.8% in December, the results showed.

“IT companies have all been improving time and response to notifications on manifest illegal hate speech,” EU Justice Commissioner Vera Jourova said at a meeting of the EU High Level Group on combating racism, xenophobia and other forms of intolerance on Wednesday. “There are differences among the companies… but we can objectively say that all have improved.”

All the companies significantly increased the number of removals. Overall, content was removed in 59.2% of cases, more than double the rate in December which was 28.2%.

The proliferation of hate speech on social media has increased pressure on the companies to remove the content swiftly as they face the prospect of legislation at both EU and national level.

Last week EU ministers approved plans to force social networks to take measures to block videos with hateful content while the German government approved a plan in April to fine companies up to 50 million euros if they fail to remove hateful postings quickly.

The most common ground of hate speech the Commission identified was xenophobia, including hatred against migrants and refugees, together with anti-Muslim hatred, followed by ethnic origin.

The spread of fake news and racist content has taken on more urgency in Germany after the arrival of about one million migrants over the last two years.