doc: deleted some not useful benchmark code.

Author: membphis

README.md

@@ -3,46 +3,7 @@ lua-var-nginx-module
 
 Fetchs Nginx variable by Luajit with FFI way which is fast and cheap.
 
-```lua
-local function test1()
-    local start_time = ngx.now()
-
-    local var = ngx.var
-    local uri
-    for i = 1, 10000 * 1000 do
-        uri = var.uri
-        if not uri then
-            uri = uri .. "xxx"
-        end
-    end
-
-    ngx.update_time()
-    ngx.say("ngx.var directly, used time: ", ngx.now() - start_time)
-end
-
-local function test2()
-    local start_time = ngx.now()
-
-    local ngxvar = require("resty.ngxvar").fetch
-    local req = ngxvar("_request")
-    local uri
-
-    for i = 1, 10000 * 1000 do
-        uri = ngxvar("uri", req)
-        if not uri then
-            uri = uri .. "xxx"
-        end
-    end
-
-    ngx.update_time()
-    ngx.say("ngxvar patch, used time: ", ngx.now() - start_time)
-end
-
-test1()     -- ngx.var directly, used time: 0.49900007247925
-test2()     -- fetch with ngxvar, used time: 0.08299994468689
-```
-
-Compares to `ngx.var`, performance has increased by more than five times. ^_^
+Compares to `ngx.var.*`, performance has increased by more than five times. ^_^
 
 
 Table of Contents