Domain authority (DA) is a search engine ranking score that predicts how likely a website is to rank on search engine result pages (SERPs). It is calculated by evaluating various factors such as linking root domains, the total number of links, into a single domain authority score.

To enhance the domain authority of your website you can follow the below-mentioned steps:

• Publish quality content on your website
• On-Page SEO
• Internal Linking
• Generate high-quality links for your website
• Dissolve broken links
• Show patience and let your domain grow
• Enhance Publishing Frequency
• Checking your domain authority

Despite this, you can also boost your domain authority via content marketing.

I would suggest you go with the results of the Google search console, because all the other tools like Ahref, Ubersuggest, and SemRush, etc are not that accurate and can show different data based on their own algorithms. But search Console is a product of Google itself and can provide more accurate and reliable results.

Yes, Website speed can have an impact on your SEO results, as Google has stated that site speed is one of the factors while ranking pages on search engine results. Therefore, Pages that take longer to load tend to have higher bounce rates and the audience spent lower average time on the page.