translate the benchmark report of v3.1.0

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+# Nebula Graph v3.1.0 Performance Report
+
+This is a performance report for Nebula Graph [v3.1.0](https://github.com/vesoft-inc/nebula/tree/release-3.1).
+
+## Test result
+
+The query and data import performance of Nebula Graph v3.1.0 is almost the same as that of v3.0.0. Some new test cases have been added to this test for `MATCH` statements that have been optimized for property reading, and the property reading performance is significantly improved compared to v3.0.0.
+
+## Test environment
+
+The server and the pressure test server are all physical computer servers.
+
+![test environment](https://docs-cdn.nebula-graph.com.cn/figures/image2021-8-23_10-38-55.png)
+
+## Test data
+
+The test data is the LDBC-SNB SF100 data set with a size of 100 GB, a total of 282,386,021 vertexes, and 1,775,513,185 edges. The number of partitions of the test graph space is 24, and the number of replicas is 3.
+
+## About LDBC-SNB
+
+The Linked Data Benchmark Council (LDBC) is a project that aims to develop benchmarks for graph and RDF data management systems. Social Network Benchmark (SNB) is one of the software benchmarks developed by LDBC. For details about the LDBC-SNB data set, refer to the following documents:
+
+- [LDBC-SNB Specification](https://ldbcouncil.org/ldbc_snb_docs/ldbc-snb-specification.pdf)
+- [LDBC-SNB DOCs](https://github.com/ldbc/ldbc_snb_docs)
+- [LDBC-SNB Data Generator (Datagen)](https://github.com/ldbc/ldbc_snb_datagen_spark)
+
+## Nebula Commit
+
+- nebula-graphd version 33fd35e
+- nebula-storaged version 33fd35e
+
+## Test description
+
+1. [K6](https://k6.io/), developed based on Golang, is used as the load testing tool, and [nebula-go](https://github.com/vesoft-inc/nebula-go) is used as the client.
+
+2. The `vu` in `50_vu` and `100_vu` on the horizontal axis indicates `virtual user`, i.e. the number of concurrent users in the performance test. `50_vu` indicates 50 concurrent users, `100_vu` indicates 100 concurrent users, and so on...
+
+3. Nebula Graph v3.0.0 is used as the performance baseline.
+
+4. ResponseTime =server-side processing time + network delay time + client-side deserializing time.
+
+## Test cases and results
+
+Only the newly added test cases for `MATCH` statements are listed.
+
+### MatchTest1
+
+match (v:Person) where id(v) == {} return count(v.Person.firstName)
+
+### MatchTest2
+
+match (v:Person)-[e:KNOWS]-(v2) where id(v) == {} and v2.Person.locationIP != 'yyy' return length(v.Person.browserUsed) + length(v2.Person.gender)
+
+### MatchTest3
+
+match (v:Person)-[e:KNOWS]-(v2) where id(v) == {} and v2.Person.locationIP != 'yyy' with v, v2 as v3 return length(v.Person.browserUsed) + (v3.Person.gender)
+
+### MatchTest4
+
+MATCH (m)-[:KNOWS]-(n) WHERE id(m)=={} OPTIONAL MATCH (n)<-[:KNOWS]-(l) RETURN length(m.Person.lastName) AS n1, length(n.Person.lastName) AS n2, l.Person.creationDate AS n3 ORDER BY n1, n2, n3 LIMIT 10
+
+### MatchTest5
+
+MATCH (m)-[:KNOWS]-(n) WHERE id(m)=={} MATCH (n)-[:KNOWS]-(l) WITH m AS x, n AS y, l RETURN x.Person.firstName AS n1, y.Person.firstName AS n2, CASE WHEN l.Person.firstName is not null THEN l.Person.firstName WHEN l.Person.gender is not null THEN l.Person.birthday ELSE 'null' END AS n3 ORDER BY n1, n2, n3 LIMIT 10
+
+## 3.1.0 vs 3.0.0（Baseline）
+
+The following test data selects the value of P99.
+
+### MatchTest1
+
+match (v:Person) where id(v) == {} return count(v.Person.firstName)
+
+### MatchTest2
+
+match (v:Person)-[e:KNOWS]-(v2) where id(v) == {} and v2.Person.locationIP != 'yyy' return length(v.Person.browserUsed) + length(v2.Person.gender)
+
+### MatchTest3
+
+match (v:Person)-[e:KNOWS]-(v2) where id(v) == {} and v2.Person.locationIP != 'yyy' with v, v2 as v3 return length(v.Person.browserUsed) + (v3.Person.gender)
+
+### MatchTest4
+
+MATCH (m)-[:KNOWS]-(n) WHERE id(m)=={} OPTIONAL MATCH (n)<-[:KNOWS]-(l) RETURN length(m.Person.lastName) AS n1, length(n.Person.lastName) AS n2, l.Person.creationDate AS n3 ORDER BY n1, n2, n3 LIMIT 10
+
+### MatchTest5
+
+MATCH (m)-[:KNOWS]-(n) WHERE id(m)=={} MATCH (n)-[:KNOWS]-(l) WITH m AS x, n AS y, l RETURN x.Person.firstName AS n1, y.Person.firstName AS n2, CASE WHEN l.Person.firstName is not null THEN l.Person.firstName WHEN l.Person.gender is not null THEN l.Person.birthday ELSE 'null' END AS n3 ORDER BY n1, n2, n3 LIMIT 10
+
+You are welcome to check out GitHub for [Nebula Graph v3.1.0](https://github.com/vesoft-inc/nebula/releases/tag/v3.1.0).