Update README.md

Updated the first paragraph

Signed-off-by: Qian Ye <[email protected]>

README.md

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-StarRocks, a Linux Foundation project, is the next-generation data platform designed to make data-intensive real-time analytics fast and easy. 
-It delivers query speeds 5 to 10 times faster than other popular solutions. StarRocks can perform real-time analytics well while updating historical records. It can also enhance real-time analytics with historical data from data lakes easily. With StarRocks, you can get rid of the de-normalized tables and get the best performance and flexibility. <br></br>
+StarRocks is the world's fastest open query engine for sub-second, ad-hoc analytics both on and off the data lakehouse. With average query performance 3x faster than other popular alternatives, StarRocks is a query engine that eliminates the need for denormalization and adapts to your use cases, without having to move your data or rewrite SQL. A Linux Foundation project. <br></br>
 
 Learn more 👉🏻 [What Is StarRocks: Features and Use Cases](https://www.youtube.com/watch?v=RfXO5GOnbW4&ab_channel=CelerData)
 
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 Starting from version 3.0, StarRocks supports a new shared-data architecture, which can provide better scalability and lower costs.
 
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