Intellisense very slow and usually takes high peeks of CPU and memory

[provide a description of the issue]
Coding, takes a lot for intellisense to show members....in cases around 4 secods, and also consumes peeks of high cpu and memory

Environment

• Operating System: Fedora 33
• JDK version: OpenJDK 11.0.9
• Visual Studio Code version:1.55.1
• Java extension version:0.76

Steps To Reproduce

Dont touch the code, and once you go and put a . in the code expecting intellisense to show members, it takes several seconds and produces a peek on cpu and memory consumption.

[Please attach a sample project reproducing the error]
Please attach logs

LOG
15:34:15 ❯ code --status
Version: Code 1.55.1 (08a217c4d27a02a5bcde898fd7981bda5b49391b, 2021-04-07T15:01:24.315Z)
OS Version: Linux x64 5.10.9-201.fc33.x86_64
CPUs: Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz (8 x 2700)
Memory (System): 30.81GB (12.12GB free)
Load (avg): 6, 23, 17
VM: 0%
Screen Reader: no
Process Argv: --no-sandbox --unity-launch --crash-reporter-id d07879a8-21a9-4e94-9263-6d6134b682bb
GPU Status: 2d_canvas: enabled
gpu_compositing: enabled
multiple_raster_threads: enabled_on
oop_rasterization: disabled_off
opengl: enabled_on
protected_video_decode: unavailable_off
rasterization: disabled_software
skia_renderer: enabled_on
video_decode: disabled_software
vulkan: disabled_off
webgl: enabled
webgl2: enabled

CPU % Mem MB PID Process
0 63 1501952 code main
0 0 1502017 zygote
0 0 1502018 zygote
0 0 1502138 utility
2 505 1502154 window (AssessmentSvcTest.java - workspace.pathfinder (Workspace) - Visual Studio Code)
0 505 1502636 extensionHost
0 0 1502910 electron_node server.js
0 63 1502917 electron_node server.js
0 0 1502925 electron_node languageserver.js
33 1578 1503130 /home/jonathan/.sdkman/candidates/java/current/bin/java --add-modules=ALL-SYSTEM --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED -Declipse.application=org.eclipse.jdt.ls.core.id1 -Dosgi.bundles.defaultStartLevel=4 -Declipse.product=org.eclipse.jdt.ls.core.product -Dfile.encoding=utf8 -noverify -Xmx1G -XX:+UseG1GC -XX:+UseStringDeduplication -javaagent:/home/jonathan/.vscode/extensions/gabrielbb.vscode-lombok-1.0.1/server/lombok.jar -jar /home/jonathan/.vscode/extensions/redhat.java-0.76.0/server/plugins/org.eclipse.equinox.launcher_1.6.100.v20201223-0822.jar -configuration /home/jonathan/.config/Code/User/globalStorage/redhat.java/0.76.0/config_linux -data /home/jonathan/.config/Code/User/workspaceStorage/45a531d9c2d51a4824623ae422ac4572/redhat.java/jdt_ws
0 63 1503338 /usr/share/code/code /usr/share/code/resources/app/extensions/json-language-features/server/dist/node/jsonServerMain --node-ipc --clientProcessId=1502636
0 63 1504100 /home/jonathan/.sdkman/candidates/java/current/bin/java -Xmx64M -XX:+UseG1GC -XX:+UseStringDeduplication -cp /home/jonathan/.vscode/extensions/redhat.vscode-microprofile-0.2.0/server/* org.eclipse.lsp4mp.ls.MicroProfileServerLauncher
0 63 1537408 /home/jonathan/.sdkman/candidates/java/current/bin/java -noverify -Xmx64M -cp /home/jonathan/.vscode/extensions/redhat.vscode-xml-0.15.0/server/org.eclipse.lemminx-0.15.0-uber.jar org.eclipse.lemminx.XMLServerLauncher
0 0 3755721 electron_node server.js
0 0 1502677 watcherService
0 63 1502662 shared-process
0 0 1502705 ptyHost
0 0 1541761 /usr/bin/zsh
0 0 3743905 /usr/bin/zsh
0 0 3769694 window (undefined)

Workspace Stats:
| Window (AssessmentSvcTest.java - workspace.pathfinder (Workspace) - Visual Studio Code)
| Folder (tackle-controls): 782 files
| File types: jar(525) sql(44) java(36) class(36) sh(8) json(7) yml(6)
| lst(6) properties(4) prefs(4)
| Conf files: github-actions(3)
| Folder (windup-operator): 1973 files
| File types: java(882) yaml(285) jar(155) release(152) yml(143) sh(85)
| class(16) xml(13) md(8) json(8)
| Conf files: github-actions(1)
| Folder (tackle-pathfinder): 3272 files
| File types: java(1516) xml(348) sql(304) jar(266) yaml(193)
| plantuml(92) sh(73) json(71) yml(69) properties(66)
| Conf files: github-actions(3) launch.json(1)
| Launch Configs: java
| Folder (tackle-commons-rest): 604 files
| File types: jar(241) java(52) class(45) prefs(14) lst(10) xml(9)
| properties(6) txt(5) yml(4) gitignore(4)
| Conf files: github-actions(3)
| Folder (windup-openshift): 5048 files
| File types: jar(2966) xml(906) groovy(113) si(44) cfe(36) cfs(36)
| txt(32) sh(23) xsl(20) json(18)
| Conf files:

首先，在报告的 Fedora 33、OpenJDK 11、VS Code 1.55.1 和 Java extension 0.76 环境中，重现输入句点后请求成员时 Java language server 出现的延迟。比较 code --status 的进程数据，并收集所请求的示例项目和日志；完成的标准是确定一个可复现的原因或可采取行动的性能证据。