Look into alternative startup commands. Personally, I'm using:
cd Desktop/Direwolf20_server
java -server -Xincgc -Xmx3G -XX:NewRatio=2 -XX:CMSFullGCsBeforeCompaction=1 -XX:SoftRefLRUPolicyMSPerMB=2048 -XX:+CMSParallelRemarkEnabled -XX:+UseParNewGC -XX:+DisableExplicitGC -Xnoclassgc -oss4M -ss4M...