caching - High CPU usage after using Redis cache in c# async -

i using https://github.com/stackexchange/stackexchange.redis. (stackexchange.redis.strongname.1.2.1)

i have async function causes cpu 100% , start getting timeout error after 4-5 min after serving 400 requests

 public async task<t> getorsetasync<t>(string cachekey, func<task<t>> getitemcallback) t : class          {              t item = null;              idatabase cache = connection.getdatabase();              var cachevalue = await cache.stringgetasync(cachekey);             if (cachevalue.isnull)             {                 item = await getitemcallback();                 await cache.stringsetasync(cachekey, jsonconvert.serializeobject(item));             }             else             {                 item = await task.factory.startnew(() => jsonconvert.deserializeobject<t>(cachevalue));             }              return item;          } 

if stop using redis cache , return direct values db, able execute load of 1300 request in 2 min 20 sec. cpu high still able complete load.

 public async task<t> getorsetasync<t>(string cachekey, func<task<t>> getitemcallback) t : class          {             return await getitemcallback();          } 

if modify function below getdatabase , nothing. cause cpu goto 100% , stuck after 200 requests in 2 min , because of high cpu.

 public async task<t> getorsetasync<t>(string cachekey, func<task<t>> getitemcallback) t : class          {            idatabase cache = connection.getdatabase();             return await getitemcallback();          } 

but question why cpu usage increased addition of

idatabase cache = connection.getdatabase(); ?

how "connection" property implemented? creating new connection redis on each call? if so, not recommended. should share single connection across calls.

private static lazy<connectionmultiplexer> lazyconnection = new lazy<connectionmultiplexer>(() => {     return connectionmultiplexer.connect("<your connection string here>"); });  public static connectionmultiplexer connection {         {         return lazyconnection.value;     } }