Why does Claude Code get slower the longer I use it?

Each turn adds to the session context, including file contents and command output, and every new call processes the whole context. Long sessions therefore slow down and cost more. Clear the context between unrelated tasks or compact it when a session runs long.

Do MCP servers slow down Claude Code?

They can. Each connected server adds tool definitions to the context, which increases tokens per call and the number of choices the model weighs. Connect only the servers a project needs and disable the rest to keep sessions fast. Many clients let you enable servers per project.

How do I make Claude Code faster?

Keep context lean by clearing or compacting it, connect fewer tools, match model and reasoning effort to the task, give specific file and function names, run focused tests rather than full suites, and filter large command outputs. A code search tool also reduces file reading.

Why Is Claude Code So Slow?

Claude Code is usually slow because the session context has grown large, many MCP tools add definitions to every call, deep reasoning is used on simple tasks, the agent is reading many large files, or the API is busy. Clearing or compacting context, trimming tools, matching effort to the task, and naming specific files usually help.

Cause 1: the context has grown large

Every message, file read, command output, and tool result stays in the session context until it is cleared or compacted. Each new call processes all of it. Long sessions therefore get slower and cost more over time. Fix: clear context between unrelated tasks, compact long sessions, and start fresh sessions for new work.

Cause 2: too many tools

Each connected MCP server contributes tool definitions that are sent with requests. Many servers mean many definitions, more tokens per call, and more choices for the model. Fix: connect only the servers a project needs, and disable those you are not using.

Cause 3: heavy reasoning on easy tasks

Extended thinking and the largest models take longer to respond. They are valuable for architecture, complex debugging, and planning, but unnecessary for renaming a variable or writing a docstring. Fix: match model and reasoning effort to the task.

Cause 4: exploring instead of targeting

Vague requests such as fix the bug lead Claude to search and read many files before acting. Each read takes time and adds context. Fix: name the files, functions, and error messages involved, or give Claude a code search tool so it finds the right snippet quickly instead of reading whole files.

Cause 5: slow commands

Claude often runs tests, builds, and scripts. If the full test suite takes minutes, so does every verification step. Fix: tell Claude which focused tests to run for the area being changed, and keep fast checks available.

Cause 6: large outputs

Commands that print huge logs or files flood the context and slow later calls. Fix: ask for filtered output, limit log lines, and avoid dumping large generated files into the session.

Cause 7: provider load and network

Response times also depend on API load and your connection. During busy periods, responses can slow regardless of setup. Fix: little can be done beyond retrying later, but a lean context reduces how much each call must process.

Cause 8: permission prompts

Frequent approval prompts can make sessions feel slow because work stops until you respond. Fix: allow safe, routine commands in your settings while keeping approval for risky actions.

A quick checklist

When Claude Code feels slow: check how long the session has been running and clear or compact it; check how many MCP servers are connected; check the model and reasoning setting; make the request more specific; check whether a slow command is running; and check provider status if everything else looks normal.

Reducing work with retrieval

The fastest call is the one you do not need. Indexing a codebase and notes lets agents retrieve precise snippets and known answers instead of reading files and regenerating explanations. RDK provides that retrieval layer; RetroDeck reports token spend falling 80 to 90 percent on repeated or reference-heavy work.

Cause 9: very large repositories

In large monorepos, searches and file listings return a lot of output, and Claude may need many reads to find the right code. Point it at the relevant package, keep generated and vendored files out of its way, and use a code search or index so it retrieves symbols rather than browsing directories.

Cause 10: oversized project memory

CLAUDE.md files load at the start of every session. If they grow into long manuals, every session pays for them in tokens and time. Keep them short, move detail into documents Claude can search when needed, and remove outdated rules.

Long-running tasks are not always slow tasks

Some tasks are legitimately long: large refactors, many files, full test runs. Breaking them into steps with checkpoints makes progress visible and lets you stop early if the approach is wrong. A long task that is moving is different from a session that is slow because of bloat.

Measuring the problem

Note when slowness started, how long the session has been running, how many files were read, and which commands ran. Comparing a fresh session on the same task with the slow one quickly shows whether context size is the cause. If a fresh session is fast, the fix is context hygiene rather than settings.

Habits that keep sessions fast

Start each task in a fresh or recently cleared session, keep CLAUDE.md short, connect only needed tools, and give precise instructions.

Frequently asked questions

Why does Claude Code get slower the longer I use it?: Each turn adds to the session context, including file contents and command output, and every new call processes the whole context. Long sessions therefore slow down and cost more. Clear the context between unrelated tasks or compact it when a session runs long.
Do MCP servers slow down Claude Code?: They can. Each connected server adds tool definitions to the context, which increases tokens per call and the number of choices the model weighs. Connect only the servers a project needs and disable the rest to keep sessions fast. Many clients let you enable servers per project.
How do I make Claude Code faster?: Keep context lean by clearing or compacting it, connect fewer tools, match model and reasoning effort to the task, give specific file and function names, run focused tests rather than full suites, and filter large command outputs. A code search tool also reduces file reading.